黄土丘陵沟壑区林草间作土壤养分和水分动态研究

Dynamics Study of Solt Nutrient and Moisture Intercropping Tree with Grass in the Loess Plateau Hill Areas

2007—2009年以黄土丘陵沟壑区不同林草间作模式为对象,以相同立地条件下的农田为对照,对林草间作地土壤养分及含水量进行了测定分析。结果表明:黄土高原丘陵沟壑区实施林草间作,在一定程度上有利于提高土壤养分含量,但不利于提高土壤水分含量;从间作年限看,9年生林草间作对土壤养分及水分含量的影响大于7年生林草间作。从空间结构看,林草间作对20、40、60 cm土层土壤养分及水分含量的影响较80、100 cm土层明显。

The objective of this research was to investigate the dynamics of nutrient and moistures in the soils of intercropping tree with grass in comparison with farmland in 2007--2009. The results indicated that intercropping increased soil nutrient concentrations but decreased soil moisture concentrations. The intercropping had more prominent impact on soil nutrient and moisture nine years old grew than seven years old grew, its had more prominent impact on the soil nutrient concentrations and moisture concentrations at the depth of 20. 40. 60 cm than 80. 100 cm.