摘要
为研究黄土高原植被恢复、退耕还林过程中根际分泌的柠檬酸对土壤养分、pH的影响,通过对石灰性土壤塿土施用外源柠檬酸,模拟根际柠檬酸环境。结果表明,施用外源柠檬酸后:(1)土壤全氮含量随柠檬酸施用天数的增加大体上有升高的趋势,土壤水解性氮含量随时间、外源柠檬酸浓度的增加而递减;(2)土壤全磷含量变化不大;(3)有效磷含量变化以40 d左右为过渡,前期土样随外源柠檬酸浓度的升高而减少,后期随柠檬酸升高而增加;(4)土壤pH与有效磷含量的变化规律呈极显著负相关;(5)有机质含量变化规律复杂。柠檬酸对土壤养分各指标的影响不同,但相互联系。
In order to study the effect of citric acid excreted by plant roots in the rhizosphere on soil nutrients of Loess Plateau during the processes of plant restoration,and returning farmland to forests or grassland,a simulated experiment was designed by applying citric acid on calcareous old manured loessal soil.The results showed ：（1） the contents of total nitrogen generally increased with the application time,the contents of hydrolysable nitrogen decreased both with the time and citric acid concentration;（2）total phosphorus changed slightly;（3） the content of available phosphorus exhibited a 40-day transition period,at the early stage,it decreased with the increase of citric acid concentration,and increased with the increased of citric acid concentration in the late stage;（4） there was a highly significant negative correlation between soil pH and the content of available phosphorus;（5） variations of soil organic matters were complicated.The effects of citric acid on soil nutrients were different but interactive.
出处
《西北林学院学报》
CSCD
北大核心
2011年第2期47-51,共5页
Journal of Northwest Forestry University
基金
国家自然科学基金(40771109)
陕西省科技攻关项目(2007K01-15-1)
关键词
黄土高原
植被恢复
退耕还林
塿土
外源柠檬酸
根际
土壤养分
Loess Plateau
plant restoration
conversion of farmland to forest land
old manured loessal soil
exogenous citricacid
rhizosphere
soil nutrient
