陇中黄土高原主要造林树种细根生物量分布  

Distribution of fine root biomass of main planting tree species in Loess Plateau,China

作　　者：荐圣淇[1] 赵传燕[1] 方书敏[1] 余凯[1] 

机构地区：[1]兰州大学生命科学学院草地农业生态系统国家重点实验室,兰州730000

出　　处：《应用生态学报》2014年第7期1905-1911,共7页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金项目(91025015;30770387);国家环境保护公益性项目(NEPCP200809098)资助

摘　　要：以2 mm为粗、细根的划分界限,采用根钻法对黄土高原安家沟流域油松、白杨、山杏、刺槐、沙棘和柠条6个主要造林树种细根分布进行研究,并测定不同林地下土壤含水率和土壤理化性质.结果表明：在水平方向上,油松细根生物量呈先增大后减小的二次多项式分布,其他5个树种细根生物量均呈对数分布,水平根系发达,细根主要分布在冠幅半径2~3倍的范围内,表明各植被通过水平扩展来获取更多的土壤水分.在垂直方向上,随着土层深度的增加,细根生物量均呈减小趋势.6种植被细根生物量与土壤水分、容重呈显著负相关,与有机质、全N含量呈显著正相关.The distribution of fine roots of Pinus tabuliformis, Populus tomentosa, Prunus armeniaca, Robinia pseudoacacia, Hippophae rhamnoides, and Caragana korshinskii was investigated by using soil core method and the fine root was defined as root with diameter less than 2 mm. The soil moisture and soil properties were measured. The results showed that in the horizontal direction, the distribution of fine root biomass of P. tabuliformis presented a conic curve, and the fine root biomass of the other species expressed logarithm correlation. Radial roots developed, the fine root biomass were concentrated within the scope of the 2-3 times crown, indicating that trees extended their roots laterally to seek water farther from the tree. In the vertical direction, the fine root biomass decreased with the increasing soil depth. Fine root biomass had significant negative correlation with soil water content and bulk density, while significant positive correlation with organic matter and total N contents.

关 键 词：黄土高原 细根 土壤水分 土壤性质 

分 类 号：S718.4[农业科学—林学]