吉林省低山丘陵区水土保持措施对土壤颗粒组成和速效养分影响分析

通过对吉林省低山丘陵区水土保持措施对土壤颗粒组成和速效养分的影响进行了分析，结果表明：目前水土保持措施下，生态修复措施是短时期内吉林省东部低山丘陵区进行土壤肥力恢复较好的措施。各措施粘粒含量均低于裸地；0-20cm土壤粘粒含量普遍低于20-40cm土壤粘粒含量，20-40cm土壤砂粒含量低于0-20cm土壤砂粒含量。各措施0~20 cm土层的速效养分含量总体上高于20~40 cm土层。水土保持措施对土壤氮素养分的修复效果要好于P、K。速效P与20-40cm的粘粒含量呈极显著负相关，其他均无显著相关性。为遏制黑土退化的趋势和保障生态安全，应结合当前国家需求，在进行水土流失综合治理的同时积极利用当地丰富的秸秆资源进行土壤培肥。

Effects of Soil Particle composition and Available Nutrient under Soil and Water Conservation Measures in Jilin Low Mountain and Mound Area

The effects of soil particle composition and available nutrient were discussed under different soil and water conservation measures in Jilin Low Mountain and Mound area. The results showed that the measure of ecology restoration would be the best choice to cure small watershed, and restore soil fertilize. The contents of clay of soil and water conservation measures were lower than which of bare plot, and the contents of clay in the depth of 0-20 cm were higher than which of 20-40 cm. The restore effect of soil available N was better than that of available P and K. Available nutrient content and soil particle composition content was not significant correlation, except available P content and soil particle composition content in the depth of 20-40 cm was very significant negative correlation. To controlling black soil degraded tendency and ensuring ecology security, improvement of soil fertility should be considered with local plenty straw and stalk when soil loss was comprehensive cured corresponding to national demand.