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title: Below-ground interspecific competition for water in a rubber agroforestry system may enhance water utilization in plants
author: Wu, Junen;  Liu, Wenjie;  Chen, Chunfeng
Issued Date: 2016
Abstract: Rubber-based (Hevea brasiliensis) agroforestry systems are regarded as the best way to improve the sustainability of rubber monocultures, but few reports have examined water use in such systems. Accordingly, we tested whether interplanting facilitates water utilization of rubber trees using stable isotope (delta D, delta O-18, and delta C-13) methods and by measuring soil water content (SWC), shoot potential, and leaf C and N concentrations in a Hevea-Flemingia agroforestry system in Xishuangbanna, southwestern China. We detected a big difference in the utilization of different soil layer water between both species in this agroforestry system, as evidenced by the opposite seasonal fluctuations in both dD and d18O in stem water. However, similar predawn shoot potential of rubber trees at both sites demonstrating that the interplanted species did not affect the water requirements of rubber trees greatly. Rubber trees with higher d13C and more stable physiological indexes in this agroforestry system showed higher water use efficiency (WUE) and tolerance ability, and the SWC results suggested this agroforestry is conductive to water conservation. Our results clearly indicated that intercropping legume plants with rubber trees can benefit rubber trees own higher N supply, increase their WUE and better utilize soil water of each soil layer.
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全文许可: Creative Commons 署名-非商业性使用-相同方式共享 3.0

Recommended Citation:
Wu, Junen,Liu, Wenjie,Chen, Chunfeng. Below-ground Interspecific Competition For Water In A Rubber Agroforestry System May Enhance Water Utilization In Plants[J]. Scientific Reports,2016,6(19502).

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