干旱区生态环境知识资源中心(Arid): 华北石质山区核桃-绿豆复合系统氘同位素变化及其水分利用

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	华北石质山区核桃-绿豆复合系统氘同位素变化及其水分利用
其他题名	Deuterium isotope variation and water use in an agroforestry system in the rocky mountainous area of North China
	孙守家 1; 孟平 2; 张劲松 2; 黄辉 2; 万贤崇 1
来源期刊	生态学报
ISSN	1000-0933
出版年	2010
卷号	30 期号:14 页码:3717-3726
中文摘要	通过对比核桃枝条和绿豆茎内deltaD值差异来分析核桃和绿豆水分来源和利用. 结果表明, 核桃-绿豆农林复合系统的根系在表层土壤(0--30 cm)中交叉存在, 生态位重叠. 旱季中表层土壤含水量与deltaD值之间存在显著的负相关关系(R~2=0. 77, P= 0. 02), 雨季相关关系不显著(R2=0. 03, P=0. 73). deltaD值分析表明, 旱季中核桃利用深层土壤(30--80cm)水分占总水分来源的51%以上, 雨季中则主要利用浅层土壤水分, 间作绿豆和单作绿豆主要利用表层土壤水分. 雨季中表层土壤水分能同时满足核桃和绿豆生长需要, 但复合系统中光能竞争导致间作绿豆光合速率显著地低于单作绿豆. 旱季间作绿豆0--20 cm土壤水分含量、凌晨叶片水势和光合速率明显高于单作绿豆, 显示间作绿豆体内水分状况好于单作绿豆. 线性模型分析结果显示间作绿豆体内约有1. 58%--5. 39%的水分来核桃夜晚水力提升, 表明复合系统在旱季一定程度上缓冲季节性水分胁迫对农作物生长的影响.
英文摘要	Water is a primary resource limiting terrestrial biological activity, particularly in arid and semi-arid regions. In this study, a temporal and spatial variation of water status in soil and Juglans regia and Vigna radiata during spring and summer in an agroforestry system in the rocky mountainous area of north China (a semi-arid region) was traced by analyzing the difference of hydrogen isotope. Root dynamics of the two species were measured in both dry and wet seasons. Variation in deltaD of was compared to detect the water sources and use. Results showed that 61. 61% of J regia roots co-existed with total roots of V radiate in shallow soil (0-30 cm depth). There was a significant difference of shallow soil water content and the delta D value between dry and wet season. A significantly inverse correlation (R2 =0. 77, P =0.02) was found between soil water content and deltaD value in dry season but not (R~2 = 0. 03, P = 0. 73) in wet season. Analyses of delta D value showed that 38. 39% of the total roots, distributed in the deep soil layers (30 - 80 cm depth), absorbed over 51% of the total water from the soil in dry season. The shallow soil provided all water in the monocropped V radiate, whereas around 1. 58% to 5.39% water in the intercropped V radiate was derived from the deep soil. In wet season, around 63.52% to 78.99% water of J regia and all water of V radiate were extracted from the shallow soil, which reflected that the shallow soil was able to synchronously meet the water need for J regia and V radiate when the shallow soil had sufficient moisture. However, photosynthetic rate of the intercropped V radiate was significant (P < 0. 05) lower than that of the monocropped due to light competition in the agroforestry system. In dry season, predawn leaf water potential and photosynthetic rate of V radiate, as well as the water content in 0 - 20 cm soil layers, in the intercropping field were significant higher than those in the monocropping field. The deltaD data also suggested approximately 1.58% to 5. 39% water in the intercropped V radiate was derived from the hydraulic lift by J regia at night. In general, the intercropped V radiate presented better water status and hence higher assimilation rate than the monocropped V radiate in dry season likely due to water lift by J regia and relative higher moisture in understory of J regia. However, the intercropped V radiate lost a certain photosynthetic capacity in wet season due to being partially shaded by J regia. Therefore, the intercropped V radiate was able to avoid harsh drought stress in dry season at the expenses of photosynthetic capacity in wet season. On the other hand, the intercropped V radiate did not competed with J regia for water resources largely due to their differential distribution of root systems. In dry season, J regia was able to extract water from the deep soil layers while the V radiate mainly depended on water from the shallow soil. In wet season water was not the limitation resource for the plant growth.
中文关键词	核桃 ; 绿豆 ; 农林复合系统 ; 同位素 ; 水分来源
英文关键词	Juglans regia Vigna radiata agroforestry system isotope water source
语种	中文
国家	中国
收录类别	CSCD
WOS类目	ECOLOGY
WOS研究方向	Environmental Sciences & Ecology
CSCD记录号	CSCD:3913895
来源机构	中国林业科学研究院林业研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/225515
作者单位	1.中国林业科学研究院林业新技术所, 北京 100091, 中国; 2.中国林业科学研究院林业研究所, 国家林业局林木培育重点实验室, 北京 100091, 中国
推荐引用方式 GB/T 7714	孙守家,孟平,张劲松,等. 华北石质山区核桃-绿豆复合系统氘同位素变化及其水分利用[J]. 中国林业科学研究院林业研究所,2010,30(14):3717-3726.
APA	孙守家,孟平,张劲松,黄辉,&万贤崇.(2010).华北石质山区核桃-绿豆复合系统氘同位素变化及其水分利用.生态学报,30(14),3717-3726.
MLA	孙守家,et al."华北石质山区核桃-绿豆复合系统氘同位素变化及其水分利用".生态学报 30.14(2010):3717-3726.