Yang Yan-feng, Zhou Hong-fei, Xu Li-gang
Xinjiang Institute of Ecology & Geography, Chinese Academy of Sciences, Urumqi 830011, China.
Ying Yong Sheng Tai Xue Bao. 2011 Jul;22(7):1711-6.
To understand the dynamic variations of soil moisture in the root zone of original Haloxylon ammodendron land is of significance for further understanding the interactions between hydrological processes and vegetations in the Gurbantunggut Desert. By using TDR probes system, this paper measured the volumetric soil moisture content in H. ammodendron land in the southern edge of Gurbantunggut Desert, and analyzed the spatiotemporal distribution of soil moisture in the root zone of H. ammodendron in August 2007-July 2008. There existed 'wet island' effect in H. ammodendron root zone. The 0-60 cm soil water storage in the root zone was 1.49 times of that in bare land. Such a difference was greater in summer than in spring and after rainfall than before rainfall. The soil moisture content in the Desert was the richest in spring after snow melting and the lowest in winter, and its annual variation could be divided into three periods, i.e., quick supplement-consumption period in spring (from March to May), slow consumption period in summer and autumn (from June to September), and stable period in winter (form October to next February). Based on wavelet analysis, the soil moisture variation in H. ammodendron root zone and bare land had a short cycle of 43 and 40 days and a long cycle of 110 and 103 days, respectively. The relatively rich soil moisture content in H. ammodendron root zone could be mainly due to the stem flow water collection, tree canopy shading, and the better water percolating capacity in root zone.
了解原始梭梭林地根区土壤水分的动态变化，对于深入认识古尔班通古特沙漠水文过程与植被之间的相互作用具有重要意义。本文利用时域反射仪（TDR）探头系统，对古尔班通古特沙漠南缘梭梭林地的土壤体积含水量进行了测定，并分析了2007年8月至2008年7月梭梭根区土壤水分的时空分布。梭梭根区存在“湿岛”效应。根区0 - 60 cm土壤储水量是裸地的1.49倍。这种差异在夏季大于春季，降雨后大于降雨前。沙漠土壤水分含量春季融雪后最丰富，冬季最低，其年变化可分为三个时期，即春季快速补充 - 消耗期（3月至5月）、夏季和秋季缓慢消耗期（6月至9月）以及冬季稳定期（10月至次年2月）。基于小波分析，梭梭根区和裸地土壤水分变化分别具有43天和40天的短周期以及110天和103天的长周期。梭梭根区土壤水分含量相对丰富，主要可能是由于茎流集水、树冠遮荫以及根区较好的水分渗透能力。
