高寒农牧交错带植被恢复对土壤有机碳、全氮含量的影响

以耕地为对照,研究了高寒农牧交错带种植老芒麦草和撂荒2种植被恢复措施对土壤有机碳和全氮含量的影响.结果表明,与耕地相比较种植老芒麦草和撂荒使0-30 cm土层土壤总有机碳含量分别增加了19.7%-22.4%和7.3%-10.6%,颗粒有机碳(0.05-2.00 mm)含量分别增加了43.0%-52.3%和28.7%-59.8%,土壤全氮含量分别增加了12.0%-20.6%和5.4%-13.7%.这一结果说明,在高寒农牧交错带通过种植老芒麦草或者撂荒植被恢复措施,对于提高土壤有机质含量和全氮含量、恢复土壤质量具有非常显著的效果.

Effects of vegetation restoration on soil organic carbon and total nitrogen contents in the alpine agropastoral ecotone

The effects of two vegetation restoration types,including Elymus sibiricus plantation and abandonment, on the soil total organic carbon, particulate organic carbon and total nitrogen contents of culti- vated soil in the alpine agro-pastoral ecotone. It was found that comparing with farming land,total soil organic carbon contents in soils at depth 0-30 cm under Elymus sibiricus plantaion and abandonment after three years was increased by 19.7 %-22.4 %and 7.3 %-10.6 % respectively,particulate organic carbon contents by 43.0 %-52. 3 % and 28.7 Y.8 % respectively and total nitrogen contents by 12.0 %- 20.6 % and 5. 4%-13.7 % respectively. The results above mean that Elymus sibiricus plantation and abandonment are effective measures for vegetation restoration in the alpine agro-pastoral ecotone,and would be favorable to the enhancement in cultivated alpine soil quality.