林木细根分布规律与土壤水分响应关系研究  

Researches on Fine Root Dynamics in Robinia pseudoacacia Forest and Its Response with Soil Moisture

作　　者：陈文庆[1] 李鹏[2] 张良恩 

机构地区：[1]黄河万家寨水利枢纽有限公司电站管理局,山西偏关036412 [2]西安理工大学,西安710048 [3]青岛市黄岛区红石崖街道办事处,山东青岛266426

出　　处：《水土保持研究》2009年第6期92-96,101,共6页Research of Soil and Water Conservation

基　　金：陕西省自然科学基金重点项目(SJ08-ZD02);"十一五"国家科技支撑计划(2006BAD09B02);国家重点基础研究发展规划项目(2007CB407206)

摘　　要：通过野外调查和室内分析,对渭北黄土高原主要造林树种的根系分布特征和土壤水分的季节变化规律进行研究。结果表明:林地土壤水分可以划分为土壤水分活跃层、土壤水分稳定利用层和土壤水分稳定层3个层次,不同立地不同层次上的土壤含水量具有不同的时空分布特征。对不同立地条件上林木根系分布特征的研究结果表明,不同立地上刺槐根系的空间分布特征具有明显差异,阴坡立地上的刺槐根系具有更大的分布空间。进一步的分析结果表明,土壤水分的变化规律与根系的分布特征有密切的关系,适宜的水分环境可以保证根系得到充分的生长发育,扩大水分养分的吸收空间,使林木的地上部分表现出更大的生产力,反之则降低林木生产力。Based on field investigation and indoor analysis, fine root dynamics and seasonal changes of soil moisture in Robinia pseudoacacia forest land on Weibei Loess Plateau was studied. Results from root investigation indicated that spatial distribution of fine root was different with site conditions, fine root on northern site had larger distribution regions. Results of soil moisture dynamics indicated that soil moisture distribution across profile could be divided into three layers： active soil moisture layer, stable--utilization soil moisture layer, and stable soil moisture layer. And site condition profoundly influenced soil moisture temporal and spatial distribution patterns. Further analysis indicated close relation was existed between soil moisture and fine root distributions. Suitable soil moisture environment promoted the growth of fine root, and consequenly showed higher productivity of above biomass; otherwise land productivity tended to be decreased.

关 键 词：根系分布特征 土壤水分 季节变化 响应关系 渭北地区 

分 类 号：S152.7[农业科学—土壤学] S715[农业科学—农业基础科学]