本文選題：茂蘭喀斯特　切入點(diǎn)：土地利用　出處：《江蘇農(nóng)業(yè)科學(xué)》2017年06期

【摘要】：以貴州茂蘭喀斯特自然保護(hù)區(qū)耕地、退耕還草地、退耕還林地、灌叢和原生林為研究對(duì)象,研究不同土地利用方式對(duì)0~20 cm土層土壤團(tuán)聚體有機(jī)碳、全氮、全磷的分布特征以及對(duì)團(tuán)聚體中有機(jī)碳、全氮、全磷含量的影響。結(jié)果表明,與耕地相比,退耕還草地、退耕還林地、灌叢和原生林明顯提高了原狀土壤及各粒徑團(tuán)聚體土壤有機(jī)碳、全氮的含量,而全磷含量則相反;隨著粒徑的逐漸減小,有機(jī)碳、全氮含量在0.25~0.50 mm粒級(jí)團(tuán)聚體中最高。相關(guān)分析表明,土壤有機(jī)碳、全氮含量均與5、2~5、1~2、0.25~0.50、≤0.25 mm粒級(jí)團(tuán)聚體之間呈極顯著相關(guān)關(guān)系,其中與5粒級(jí)團(tuán)聚體呈極顯著負(fù)相關(guān),而與0.5~1.0 mm粒級(jí)團(tuán)聚體不相關(guān);全磷含量與有機(jī)碳、全氮含量及2~5、0.25~0.50 mm粒級(jí)呈極顯著負(fù)相關(guān),與5、2~5 mm粒級(jí)團(tuán)聚體呈顯著相關(guān),而全磷含量與0.5~1.0 mm、≤0.25 mm粒級(jí)團(tuán)聚體間不相關(guān)。
[Abstract]:Using cultivated land, grassland, shrub and native forest in Maolan Karst Nature Reserve, Guizhou Province as the research object, the soil aggregate organic carbon and total nitrogen in 0 ~ 20 cm soil layer were studied by different land use methods.Distribution of total phosphorus and its effect on organic carbon, total nitrogen and total phosphorus content in aggregates.The results showed that, compared with cultivated land, returning farmland to grassland, returning cropland to forest, shrub and native forest significantly increased the contents of organic carbon, total nitrogen and total phosphorus in undisturbed soil and aggregates of various particle sizes, but the total phosphorus content decreased gradually with the grain size decreasing.The content of organic carbon and total nitrogen was the highest in 0.25m 0.50mm agglomerates.Correlation analysis showed that soil organic carbon and total nitrogen content were significantly correlated with 0.25 0.50, 鈮，

本文編號(hào)：1723156