{"title":"The Yield and Water Use Efficiency to First Cutting Date of Siberian Wildrye in North China","authors":"Zi-zhong LI, Wei-hua ZHANG, Yuan-shi GONG","doi":"10.1016/S1671-2927(11)60170-3","DOIUrl":null,"url":null,"abstract":"<div><h3>Abstract</h3><p>A field experiment study was conducted in Bashang Plateau in North China in 2008 to determine the effect of three first cutting dates on the growth and water use efficiency (WUE) of Siberian wildrye (<em>Elymus sibiricus</em> L.) in the agropastoral ecotone of North China (APENC). The experiment was conducted in a split plot design with three replications with water supply regime as the main plot treatment and first cutting date as the subplot treatment. Two water supply regimes were used, which included rain-fed treatment as control (CK) and a single irrigation and straw mulch treatment (W). Three first cutting date treatments were conducted at early heading stage on July 1 (E), at late heading stage on July 12 (L), and at flowering stage on July 27 (F), respectively. The results showed that the forage yield and WUE were the lowest at early heading stage harvest, while the highest at flowering stage either in CK or W treatment. Under combined CK and W treatments, average forage yields of the F subplots were 2 900 and 6 703 kg ha<sup>−1</sup>, and the values of WUE were 0.82 and 2.28 kg m<sup>−3</sup>, respectively. Under the CK treatment, forage yields of the E and L subplots were 43.8 and 41.9% lower than the F subplots, and their values of WUE were 46.2 and 50.3% lower than F, respectively. Under the W treatment, the forage yields of the E and L subplots were 74.9 and 61.6% lower, and their values of WUE were 78.1 and 63.3% lower, respectively, as compared with F subplots. Therefore, earlier first cutting did not increase the regrowth of Siberian wildrye and improve the mismatch between rainy season and the period of high growth potential of the grass in the semiarid APENC.</p></div>","PeriodicalId":7475,"journal":{"name":"Agricultural Sciences in China","volume":"10 11","pages":"Pages 1716-1722"},"PeriodicalIF":0.0000,"publicationDate":"2011-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1671-2927(11)60170-3","citationCount":"3","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Agricultural Sciences in China","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1671292711601703","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 3
Abstract
A field experiment study was conducted in Bashang Plateau in North China in 2008 to determine the effect of three first cutting dates on the growth and water use efficiency (WUE) of Siberian wildrye (Elymus sibiricus L.) in the agropastoral ecotone of North China (APENC). The experiment was conducted in a split plot design with three replications with water supply regime as the main plot treatment and first cutting date as the subplot treatment. Two water supply regimes were used, which included rain-fed treatment as control (CK) and a single irrigation and straw mulch treatment (W). Three first cutting date treatments were conducted at early heading stage on July 1 (E), at late heading stage on July 12 (L), and at flowering stage on July 27 (F), respectively. The results showed that the forage yield and WUE were the lowest at early heading stage harvest, while the highest at flowering stage either in CK or W treatment. Under combined CK and W treatments, average forage yields of the F subplots were 2 900 and 6 703 kg ha−1, and the values of WUE were 0.82 and 2.28 kg m−3, respectively. Under the CK treatment, forage yields of the E and L subplots were 43.8 and 41.9% lower than the F subplots, and their values of WUE were 46.2 and 50.3% lower than F, respectively. Under the W treatment, the forage yields of the E and L subplots were 74.9 and 61.6% lower, and their values of WUE were 78.1 and 63.3% lower, respectively, as compared with F subplots. Therefore, earlier first cutting did not increase the regrowth of Siberian wildrye and improve the mismatch between rainy season and the period of high growth potential of the grass in the semiarid APENC.
摘要/ abstract摘要:2008年，在坝上高原进行了3个刈割期对华北农牧交接带西伯利亚野羊草生长和水分利用效率的影响试验研究。试验采用3个重复的分割小区设计，以供水制度为主小区处理，首次采伐日期为次小区处理。采用两种供水方式，即对照雨养处理(CK)和单灌秸秆覆盖处理(W)。分别在7月1日抽穗前期(E)、7月12日抽穗后期(L)和7月27日开花期(F)进行三次首次刈割处理。结果表明，CK和W处理的牧草产量和水分利用效率在抽穗前期最低，在开花期最高;对照和W组合处理下，F样地平均产草量分别为2 900和6 703 kg ha - 1, WUE分别为0.82和2.28 kg m - 3。CK处理下，E和L小区的牧草产量分别比F小区低43.8%和41.9%，WUE值分别比F小区低46.2%和50.3%。W处理下，E和L小区的牧草产量分别比F小区低74.9%和61.6%，WUE值分别比F小区低78.1和63.3%。因此，提前首次刈割并没有增加西伯利亚野地的再生，也没有改善半干旱APENC草地雨季与高生长潜力期的不匹配。
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