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在科尔沁沙地南缘章古台地区,对采用3种营林措施的樟子松人工林土壤养分、酶活性和微生物量碳进行测定分析,结果表明:2001围封处理区除速效钾外其它测定指标都低于对照区和同龄2007年围封处理区,2001围封+间伐处理区与其它处理相比,除全磷、速效钾和中性磷酸酶外,其它指标显著提高;32年生林分已修枝7年的樟子松人工林,随修枝强度的增大,土壤脲酶活性和微生物量碳增加,土壤过氧化氢酶和中性磷酸酶活性及土壤养分含量下降;40年生左右的樟子松人工林,通过卫生伐改造成疏林处理区与对照区相比,土壤养分含量、酶的活性和微生物量碳显著提高。研究认为沙地樟子松人工林地力衰退可通过营林措施加以控制,关键要合理经营。
The soil nutrient, enzyme activity and microbial biomass carbon of Pinus sylvestris var.mongolica plantations were measured and analyzed in the Zhanggutai area on the southern margin of Horqin sandy land. The results showed that in 2001, Compared with other treatments, except for total phosphorus, available potassium and neutral phosphatase, other indicators were significantly increased; 32-year-old forest In Pinus sylvestris var. Mongolica plantations that have been pruned for 7 years, with the increase of pruning strength, soil urease activity and microbial biomass carbon increased, soil catalase and neutral phosphatase activity and soil nutrient content decreased; about 40 years old The Pinus sylvestris var. Mongolica plantation had a significant increase in soil nutrient content, enzyme activity and microbial biomass carbon as compared with the control. The study suggests that the decline of the productivity of Pinus sylvestris var. Mongolica plantations in sandy land can be controlled by silviculture measures. The key is to manage rationally.