土壤水分下降对不同树龄日本柏树液流密度日变化和季节变化的影响

IF 1.7 3区 农林科学 Q2 FORESTRY
K. Tsuruta, T. Kume, H. Komatsu, K. Otsuki
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引用次数: 4

摘要

在预测亚洲季风影响下湿润地区森林蒸腾作用时,土壤干旱对蒸腾作用的影响往往被忽略。这些影响确实被日本及其周边地区的主要人工林树种日本柏树Chamaecyparis obtusa所忽视,可能是因为以前的研究没有报告土壤干旱对日本柏林蒸腾作用的明确影响。然而,一些研究报告了日本柏树幼林的蒸腾作用随着土壤干旱而明显减少。目前尚不清楚这种蒸腾作用的减少是否仅限于幼小的日本柏林,还是在日本占据大片面积的成熟的日本柏林中并不罕见。为了澄清这一点,我们在土壤干旱的一年里对三种不同年龄的日本柏树进行了树液通量测量,包括成熟(43岁)和相对年轻(23岁和26岁)的树木。在日时间尺度上,对树液通量密度(Fd)与水汽压亏缺(VPD)进行交叉相关分析表明,在干燥土壤条件下,Fd与VPD的时间滞后为1 ~ 3 h。所有样本树木的这些变化都大于湿润土壤条件下(<1 h)的变化。在一定VPD条件下,所有样树在干燥土壤条件下的Fd均小于湿润土壤条件下的Fd;在干燥土壤条件下,Fd的变化率降低了28% ~ 63%。由于我们的结果是在记录的月降水不超过概率为9%-18%的情况下获得的,结果表明需要更广泛地考虑土壤干旱的影响。在预测土壤干旱年份日际和季节的蒸腾模式时,以及在预测湿润温带气候条件下日本柏树蒸腾的年际模式时,不仅要考虑相对年轻的日本柏树,而且要考虑成熟的日本柏树。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effects of soil water decline on diurnal and seasonal variations in sap flux density for differently aged Japanese cypress (Chamaecyparis obtusa) trees
The effects of soil drought on transpiration are often neglected when predicting transpiration for forests in humid regions under the influence of the Asian monsoon. These effects have indeed been neglected for Japanese cypress, Chamaecyparis obtusa, a major plantation species in Japan and the surrounding area, probably because previous studies have reported no clear effects of soil drought on transpiration for Japanese cypress forests. However, a few studies have reported an apparent reduction in transpiration with soil drought for young Japanese cypress forests. It remains unclear whether such a reduction in transpiration is limited to young Japanese cypress forests or if it is not uncommon for mature Japanese cypress forests, which occupy a large area in Japan. To clarify this point, we conducted sap flux measurements in a year with soil drought on three differently aged Japanese cypress stands including mature (43 years old) and relatively young (23 and 26 years old) trees. In a diurnal time scale, a cross correlation analysis of sap flux density (Fd) and vapor pressure deficit (VPD) showed that the time lags between Fd and VPD were 1-3 h in dry soil conditions. These were larger than those of wet soil conditions (<1 h) for all sample trees. Fd at a given VPD in dry soil conditions was smaller than that in wet soil conditions for all sample trees; a 28%–63% reduction in the rate of change in Fd was observed under dry soil conditions. Because our results were obtained when the non-exceedance probability of recorded monthly precipitation was 9%–18%, the results suggest the need to consider the effects of soil drought more extensively. Those effects should be considered for not only relatively young but also mature Japanese cypress when predicting diurnal and seasonal patterns of transpiration in years with soil drought, and when predicting inter-annual patterns of transpiration for Japanese cypress despite humid temperate climate.
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来源期刊
CiteScore
2.20
自引率
11.10%
发文量
11
审稿时长
12 weeks
期刊介绍: Annals of Forest Research is a semestrial open access journal, which publishes research articles, research notes and critical review papers, exclusively in English, on topics dealing with forestry and environmental sciences. The journal promotes high scientific level articles, by following international editorial conventions and by applying a peer-review selection process.
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