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为探明集约经营对毛竹林土壤碳库、氮库以及酶活性的影响,在浙江省临安市选取相邻的粗放经营毛竹林和集约经营毛竹林(经营年限为15年),测定表层(0~20 cm)与亚表层(20~40 cm)土壤不同形态碳氮和蔗糖酶、脲酶、过氧化氢酶和酸性磷酸酶的活性.结果表明:长期集约经营显著降低毛竹林土壤有机碳含量和储量,表层和亚表层土壤有机碳储量分别下降13.2%和18.0%;集约经营15年后,毛竹林表层和亚表层土壤水溶性碳、热水溶性碳、微生物生物量碳和易氧化碳含量均显著降低;与粗放经营毛竹林相比,集约经营毛竹林表层和亚表层土壤氮储量分别增加50.8%和36.6%;集约经营显著增加毛竹林土壤硝态氮和铵态氮含量,显著降低土壤水溶性氮和微生物生物量氮含量;集约经营15年后,毛竹林表层土壤蔗糖酶、脲酶、过氧化氢酶和酸性磷酸酶活性均显著下降,亚表层土壤酸性磷酸酶活性显著下降,而其他酶活性均无显著变化.长期集约经营导致毛竹林土壤碳储量、活性碳库和微生物活性显著下降,在以后的经营过程中要注意化肥与有机肥配合使用,以保证毛竹林的可持续经营.
In order to find out the effect of intensive management on the soil carbon pool, nitrogen pool and enzyme activity in the forest, the adjacent extensive management bamboo forest and intensive management bamboo forest were selected in Lin’an City, Zhejiang Province (the operating period was 15 years) ~ 20 cm) and subsoil (20 ~ 40 cm) soil. The results showed that long-term intensive management significantly reduced soil organic carbon content and After 15 years of intensive management, the contents of water-soluble carbon, hot-water soluble carbon, microbial biomass carbon and readily oxidizable carbon in the surface and subsurface soil of Phyllostachys pubescens plantations were all decreased by 13.2% and 18.0% Compared with the extensive management of Phyllostachys pubescens, the nitrogen reserves of the surface and subsurface soil of intensively managed Phyllostachys pubescens increased by 50.8% and 36.6%, respectively. Intensive management significantly increased the contents of nitrate nitrogen and ammonium nitrogen in the soils, and significantly reduced the soil water solubility Nitrogen and microbial biomass nitrogen content. After intensive management for 15 years, the activities of sucrase, urease, catalase and acid phosphatase in surface soils of Phyllostachys pubescens significantly decreased. The contents of acid phosphatase While the activity of other enzymes had no significant change.Under long-term intensive management, the soil carbon storage, active carbon pool and microbial activity of Phyllostachys pubescens forest decreased significantly, and fertilizer and organic fertilizer should be used together in the future to ensure the gross Bamboo forest sustainable management.