Responses to precipitation treatment for Haloxylon ammodendron growing on contrasting textured soils
Responses to precipitation treatment for Haloxylon ammodendron growing on contrasting textured soils
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DOI：
10.1007/s11284-009-0642-1
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发表时间：
2009
影响因子：
2
通讯作者：
T. Zou;Yan Li;Hao Xu;Guiqing Xu
中科院分区：
文献类型：
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作者：
T. Zou;Yan Li;Hao Xu;Guiqing Xu
梭梭对降水的响应盆栽(藜科)是一种生长在质地不同的土壤上的小型旱生乔木，在2006年的整个生长季中，分别在无降水、自然降水和双重降水处理下进行了评估。与之形成鲜明对比的质地土壤是沙质和重质地，两者都是h的原始栖息地。位于中亚古班通古特沙漠南缘的阿莫德隆。在整个生长季对光合作用、叶水势、蒸腾作用、水分利用效率和叶片生物量进行了监测。根的分布。在实验结束时对阿莫地隆进行评估。总体而言，这棵小树在两种土壤上的光合碳同化方面都没有表现出对夏季大降水脉冲或降水处理的显著响应。沙地植物的叶片水势、蒸腾作用和水分利用效率对大雨脉冲和降水处理表现出高度的敏感性，沙地植物的叶片生物量生产也远高于质地较重的土壤。在沙质土壤中，黎明前叶水势低于−3.0时发生落叶，而在质地较重的土壤中，黎明前叶水势低于−3.75时发生落叶。对于类似的地上部分，沙地上的小树形成了更深的根系，并且与质地较重的地点相比，饲养根的表面积几乎是前者的两倍。在相同的气候条件下，生长在粗质地上的毛竹，部分由于根系较深、较大，水分条件要好于重质地。
The responses to precipitation ofHaloxylon ammodendron(C.A. Mey.) Bunge (Chenopodiaceae), a small xerophilous tree growing on contrasting textured soils, were evaluated under no, natural, and double precipitation treatments during the entire growing season of 2006. The contrasting textured soils are sandy and heavy textured, and both are the original habitat ofH. ammodendronat the south edge of Gubantonggute Desert, Central Asia. Photosynthesis, leaf water potential, transpiration, water use efficiency and leaf biomass production were monitored throughout the growing season. Root distribution ofH. ammodendronwas evaluated at the end of the experiment. Overall, this small tree did not show significant response to a large summer precipitation pulse or precipitation treatments, in terms of photosynthetic carbon assimilation on either soil. The leaf water potential, transpiration, and water use efficiency appeared to be highly sensitive to a large precipitation pulse and precipitation treatments in sandy soil; and leaf biomass production was also much higher for plants in sandy than that of heavy-textured soil. In sandy soil, defoliation occurred when pre-dawn leaf water potential dropped below −3.0 MPa, while in heavy-textured soil, defoliation occurred when pre-dawn leaf water potential dropped below −3.75 MPa. For similar above-ground parts, the small trees at the sandy site developed much deeper root systems and had nearly double the surface area of feeder roots compared to those at the heavy-textured site. Partially owning to the deeper and larger root system,H. ammodendrongrowing at coarse-textured site was in better water conditions than those at heavy-textured site under the same climatic conditions.