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Recently published papers 最近发表的论文
Agricultural Meteorology Pub Date : 1983-08-01 DOI: 10.1016/0002-1571(83)90091-2
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引用次数: 0
A simple photographical method for analyzing the radiation interception by an individual tree 一种分析单株树辐射拦截的简单摄影方法
Agricultural Meteorology Pub Date : 1983-08-01 DOI: 10.1016/0002-1571(83)90089-4
P Van Elsacker, H Keppens, I Impens
{"title":"A simple photographical method for analyzing the radiation interception by an individual tree","authors":"P Van Elsacker,&nbsp;H Keppens,&nbsp;I Impens","doi":"10.1016/0002-1571(83)90089-4","DOIUrl":"10.1016/0002-1571(83)90089-4","url":null,"abstract":"<div><p>A method for analyzing radiation interception by an individual tree is presented. The use of a whole set of expensive radiation instruments is eliminated, the work-intensive field experiments are reduced to half a day for a large tree (9 m), and neither clear sky conditions nor diffuse radiation data are necessary. It is assumed that for a given azimuth and solar elevation the shading caused by a tree can be estimated photographically by taking a slide in the opposite direction. From slides taken of the whole tree in different directions and from different distances (i.e., different view angles), gap frequencies for certain heights are measured. At each height, gap frequency decreases significantly with increasing solar elevation. By calculating the mean path length within the crown (<em>s</em>) corresponding with each gap frequency (<em>g</em>), a highly significant exponential relationship between both is obtained [<em>g</em> = exp(−0.42<em>s</em>)]. With this equation and by knowing the tree dimensions calculated from the slides, direct and diffuse radiation interception of the whole tree can be estimated. Total leaf area and leaf area density are also calculated. These values agree very well with direct measurements on similar cut trees.</p></div>","PeriodicalId":100061,"journal":{"name":"Agricultural Meteorology","volume":"29 4","pages":"Pages 285-298"},"PeriodicalIF":0.0,"publicationDate":"1983-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0002-1571(83)90089-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91076781","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 19
Recently published papers 最近发表的论文
Agricultural Meteorology Pub Date : 1983-07-01 DOI: 10.1016/0002-1571(83)90069-9
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引用次数: 0
Stomatal regulation of evaporation from well-watered plant canopies: a new synthesis 水分充足的植物冠层蒸发量的气孔调节:一个新的合成
Agricultural Meteorology Pub Date : 1983-07-01 DOI: 10.1016/0002-1571(83)90068-7
Sherwood B. Idso
{"title":"Stomatal regulation of evaporation from well-watered plant canopies: a new synthesis","authors":"Sherwood B. Idso","doi":"10.1016/0002-1571(83)90068-7","DOIUrl":"10.1016/0002-1571(83)90068-7","url":null,"abstract":"<div><p>New experimental evidence is presented to resolve a long-standing controversy relative to the existence or non-existence of evaporation control by stomata in situations where the water supply to plant roots is non-limiting. It is shown that both sides of the argument were correct in certain respects, but that the claim for significant stomatal control was the one most representative of reality in the broadest perspective.</p></div>","PeriodicalId":100061,"journal":{"name":"Agricultural Meteorology","volume":"29 3","pages":"Pages 213-217"},"PeriodicalIF":0.0,"publicationDate":"1983-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0002-1571(83)90068-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85411538","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 29
Further experiments on the measurement of leaf wetness 叶片湿度测量的进一步试验
Agricultural Meteorology Pub Date : 1983-07-01 DOI: 10.1016/0002-1571(83)90067-5
A. Weiss, A.F. Hagen
{"title":"Further experiments on the measurement of leaf wetness","authors":"A. Weiss,&nbsp;A.F. Hagen","doi":"10.1016/0002-1571(83)90067-5","DOIUrl":"10.1016/0002-1571(83)90067-5","url":null,"abstract":"<div><p>Two experiments on the measurement of leaf wetness are reported. From the results of a previous experiment, a thin (0.28 mm), double sided circuit board sensor was constructed (sensor C). It was compared to the two sensors used in the original experiment, a cotton cloth on a grid network of two independent fine wires (sensor A) and a thick single board painted with gray latex paint (sensor B). As in the initial experiment, sensor A was found to be the superior sensor, while sensor C gave better results than sensor B. Honeydew, the sugary excrement of sucking insects, caused spurious results from sensors B and C, while sensor A appeared to be unaffected. In the second experiment, leaf wetness was measured with the same three sensors in two plots; a plot treated with an insecticide and a non-treated plot. Sensor A was the superior sensor based on the greatest duration of leaf wetness and comparison with visual observations. The hygroscopic nature of the honeydew increased the duration of leaf wetness between the plots by ∼25% as measured by sensor A.</p></div>","PeriodicalId":100061,"journal":{"name":"Agricultural Meteorology","volume":"29 3","pages":"Pages 207-212"},"PeriodicalIF":0.0,"publicationDate":"1983-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0002-1571(83)90067-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75904657","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 25
Simulating the effects of weather variables and soil water potential on a corn canopy temperature 模拟天气变量和土壤水势对玉米冠层温度的影响
Agricultural Meteorology Pub Date : 1983-07-01 DOI: 10.1016/0002-1571(83)90064-X
Bhaskar Choudhury
{"title":"Simulating the effects of weather variables and soil water potential on a corn canopy temperature","authors":"Bhaskar Choudhury","doi":"10.1016/0002-1571(83)90064-X","DOIUrl":"10.1016/0002-1571(83)90064-X","url":null,"abstract":"<div><p>The effect of atmospheric vapor pressure deficit (<em>VPD</em>) on canopy-air temperature differnce (<em>δ</em><em>T</em>) of corn (<em>Zea mays</em> L.) is simulated using a soil—plant—atmosphere model together with weather data for several clear-sky days. Considering empirical dependence of stomatal resistance of corn on the leaf water potential and insolation, the model finds an analytic solution for the leaf water potential which satisfies Monteith's and van den Honert's equations for transpiration. The simulated leaf water potentials are compared with observations. For a large portion of the daylight period a near-linear relationship between <em>δT</em> and <em>VPD</em> is found at various soil water potentials. Among weather variables, the air <em>VPD</em> appears to be the most important factor affecting <em>δT</em> for unstressed canopies. With decreasing soil water potential the sensitivity of <em>δT</em> to wind speed increases. The effect of differing rooting densities on <em>δT</em> is also studied. As the rooting density increases the <em>δT</em> values decrease, indicating that <em>δT</em><em>v</em>. <em>VPD</em> relationship could change with crop age and the soil strength conditions affecting the root growth.</p></div>","PeriodicalId":100061,"journal":{"name":"Agricultural Meteorology","volume":"29 3","pages":"Pages 169-182"},"PeriodicalIF":0.0,"publicationDate":"1983-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0002-1571(83)90064-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72897698","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 36
Verification of a simple micrometeorological method for estimating the rate of gaseous mass transfer from the ground to the atmosphere 估算气体质量从地面向大气转移速率的一种简单微气象方法的验证
Agricultural Meteorology Pub Date : 1983-07-01 DOI: 10.1016/0002-1571(83)90065-1
J.D. Wilson , V.R. Catchpoole , O.T. Denmead , G.W. Thurtell
{"title":"Verification of a simple micrometeorological method for estimating the rate of gaseous mass transfer from the ground to the atmosphere","authors":"J.D. Wilson ,&nbsp;V.R. Catchpoole ,&nbsp;O.T. Denmead ,&nbsp;G.W. Thurtell","doi":"10.1016/0002-1571(83)90065-1","DOIUrl":"10.1016/0002-1571(83)90065-1","url":null,"abstract":"<div><p>Wilson et al. proposed a simple micrometeorological method of estimating the rate of gaseous mass transfer to the atmosphere from a small circular plot which required measurements of time-average species-concentration and horizontal windspeed at a single height. This method has been applied here to estimate the rate of volatilization of ammonia from a 25 m radius plot treated with urea fertilizer. The emission rates thus obtained agreed satisfactorily with estimates based on a mass balance which employed concentration and windspeed measurements at five levels.</p></div>","PeriodicalId":100061,"journal":{"name":"Agricultural Meteorology","volume":"29 3","pages":"Pages 183-189"},"PeriodicalIF":0.0,"publicationDate":"1983-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0002-1571(83)90065-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80663001","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 112
Photosynthesis of a Scots pine shoot: The effect of shoot inclination on the photosynthetic response of a shoot subjected to direct radiation 苏格兰松枝条的光合作用:枝条倾角对直接辐射下枝条光合反应的影响
Agricultural Meteorology Pub Date : 1983-07-01 DOI: 10.1016/0002-1571(83)90066-3
Pauline Oker-Blom, Seppo Kellomaki, Heikki Smolander
{"title":"Photosynthesis of a Scots pine shoot: The effect of shoot inclination on the photosynthetic response of a shoot subjected to direct radiation","authors":"Pauline Oker-Blom,&nbsp;Seppo Kellomaki,&nbsp;Heikki Smolander","doi":"10.1016/0002-1571(83)90066-3","DOIUrl":"10.1016/0002-1571(83)90066-3","url":null,"abstract":"<div><p>A set of photosynthetic responses of a Scots pine (<em>Pinus sylvestris</em> L.) shoot to light was derived from the shoot geometry and the photosynthetic response of a single needle. Computations showed that the shape of the photosynthesis light-curves varies substantially depending on the direction of radiation relative to the shoot position. Differences in the initial and maximum rates of photosynthesis were due to changes in the effective projection area and the irradiated fraction of the shoot, respectively.</p></div>","PeriodicalId":100061,"journal":{"name":"Agricultural Meteorology","volume":"29 3","pages":"Pages 191-206"},"PeriodicalIF":0.0,"publicationDate":"1983-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0002-1571(83)90066-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86326658","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 39
Water stress and water-use efficiency in field grown wheat: A comparison of its efficiency with that of C4 plants 田间小麦水分胁迫与水分利用效率:与C4植株的比较
Agricultural Meteorology Pub Date : 1983-07-01 DOI: 10.1016/0002-1571(83)90063-8
P.K. Aggarwal, S.K. Sinha
{"title":"Water stress and water-use efficiency in field grown wheat: A comparison of its efficiency with that of C4 plants","authors":"P.K. Aggarwal,&nbsp;S.K. Sinha","doi":"10.1016/0002-1571(83)90063-8","DOIUrl":"10.1016/0002-1571(83)90063-8","url":null,"abstract":"<div><p>Two cultivars of wheat, contrasting in their drought resistance characteristics, were grown under irrigated and non-irrigated conditions in the field for two seasons. The water-use efficiency (<em>WUE</em>) ranged from 0.5 to 13.8 g dry matter kg<sup>−1</sup> water used depending upon the growth stage, cultivar and water stress. The average <em>WUE</em> for the season was between 3.34 and 4.70 g dry matter kg<sup>−1</sup> water used. Regression analysis indicated that <em>WUE</em> was a function of dry matter produced and had no direct statistical relationship with the weather parameter. The <em>WUE</em> of plants having the C<sub>3</sub> system of photosynthesis, like wheat, need not be poorer than the plants with the C<sub>4</sub> system if comparisons are made of plants growing in their respective preferred ecological niches. Various possible reasons for the low values of <em>WUE</em> reported for C<sub>3</sub> plants are discussed.</p></div>","PeriodicalId":100061,"journal":{"name":"Agricultural Meteorology","volume":"29 3","pages":"Pages 159-167"},"PeriodicalIF":0.0,"publicationDate":"1983-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0002-1571(83)90063-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77023532","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 8
Recently published papers 最近发表的论文
Agricultural Meteorology Pub Date : 1983-06-01 DOI: 10.1016/0002-1571(83)90076-6
{"title":"Recently published papers","authors":"","doi":"10.1016/0002-1571(83)90076-6","DOIUrl":"https://doi.org/10.1016/0002-1571(83)90076-6","url":null,"abstract":"","PeriodicalId":100061,"journal":{"name":"Agricultural Meteorology","volume":"29 1","pages":"Pages 63-77"},"PeriodicalIF":0.0,"publicationDate":"1983-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0002-1571(83)90076-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136900283","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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