刺槐林地土壤水分与林下植物生物量的关系  

Relationship Between Soil Moisture of Robinia pseudoacacia Forests and Aboveground Biomass of Understory Vegetation

作　　者：刘江华[1,2] 刘国彬[2] 陈淑芸[1] 

机构地区：[1]西南林学院,昆明650224 [2]中国科学院教育部水土保持与生态环境研究中心,陕西杨陵712100

出　　处：《水土保持研究》2009年第3期57-60,共4页Research of Soil and Water Conservation

基　　金：国家自然科学基金重点项目(90502007);中科院科学院西部行动计划(KZCX2-XB2-05);国家自然科学基金(30671672)

摘　　要：对比研究了安塞县不同林龄刺槐林地及撂荒地土壤水分年际变化特征及样地生物量特征。结果表明,刺槐林地土壤水分含量及储水量随林龄增长降低,过熟林的剖面含水率接近凋萎湿度;0-140 cm土层生长季土壤水分变异系数遵循过熟林>成熟林>幼龄林>撂荒地的规律,而140-500 cm土层则基本与上述规律相反。成过熟刺槐林下植被地上部生物量略高于同期撂荒地,土壤水分与地上部生物量仅存在微弱的负相关关系。说明刺槐生长虽然消耗了大量土壤储水,并未降低林地生产力。将刺槐作为先锋树种用于研究区的植被恢复有助于迅速形成植被覆盖,林下植被的健康发育足以保证刺槐衰退后的生态系统持续稳定地发挥其生态功能。By studying on soil water content（SWC%）and aboveground biomass of understory vegetation of Robinia pseudoacacia tree-land and abandoned farmland in Ansai county, the results showed that SWC% of Robinia pseudoacacia tree-land decreased with the trees growing-up. SWC% variation coefficient at 0- 140 cm depth increased with the trees growing-up, but that of 140-500 cm depth had adverse trend. Aboveground biomass of understory vegetation of matured and over-matured tree-lands was faintly higher than that of abandoned farmland. We concluded that the productivity of Robinia pseudoacacia tree-land did not descend although the trees consumed most soil water and SWC% dropped down seriously.

关 键 词：刺槐 土壤水分 地上部生物量 

分 类 号：S715[农业科学—林学] S714.3