摘要
选取玛曲高寒围封草地(封育草地、修复草地)、开垦地(燕麦地)以及不同退化程度草地(中度退化草地、黑土滩草地、沙化草地),对土壤养分进行分析研究。结果表明:草地的开垦与退化,使土壤有机碳(SOC)、全N、有效N、全P、有效P含量显著下降,而pH值却显著升高。随着草地的开垦与退化,全K、有效K变化不明显,沙化草地土壤中全Ca含量显著增高,约是其它利用方式的3倍以上。中度退化草地的全Mg含量最高,燕麦地、封育草地也出现了较高的Mg含量,但无显著差异。各项养分指标之间存在一定相关性,尤其是SOC与全N、有效N呈极显著正相关,与全P、有效P、全K、有效K、全Mg含量呈显著正相关,与全Ca含量呈显著负相关关系。土壤pH值与土壤全Ca含量呈显著正相关关系,而与土壤其他养分呈显著负相关关系。土壤全Ca与全Mg之间呈显著正相关。
Soil netrients in enclosed grassland, farmland and degraded grassland in alpine meadow in Maqu were analyzed. The results showed that contents of soil organic carbon （SOC）, total N and available N, total P and available P declined observably due to grassland reclaimation and degradation, while the pH value increased greatly. The change of total K and available K contents were unconspicuous. Soil total Ca content of desertification grassland was the highest, almost three times higher than those in other land-use types. For the content of total Mg, moderate degraded grassland was the highest, reclaimation and fenced grassland were higher, however, there was no significant difference between them. There were certain correlations among different soil nutrient indices, especially between SOC and other indices. There were highly significant positive correlations between SOC and total N, available N. SOC was significantly positively correlated with many soil nutrients, such as total P, available P, total K, available K and total Mg. There was a significant negative correlation between SOC and total Ca. Soil pH value was correlated positively with soil total Ca content, but was negative correlated with other soil nutrients. There is a significant positive correlation between Ca and Mg.
出处
《中国草地学报》
CSCD
北大核心
2009年第6期80-87,共8页
Chinese Journal of Grassland
基金
国家重点基础研究发展规划项目("973"项目)(2007CB108903)
甘肃省重大科技项目(2GS063-A31-010)
国家自然科学基金项目(30800801)资助
关键词
玛曲
高寒草地
利用方式
土壤养分
Maqu
Alpine meadow
Utilization types
Soil nutrients
