林下植被去除对樟子松人工林土壤酶活性的影响  

Effects of understory removal on soil enzyme activities in a Pinus sylvestris var. mongolica plantation in Horqin Sandy Land

作　　者：郑琳琳[1,2] 赵琼 曾德慧[1] 

机构地区：[1]中国科学院沈阳应用生态研究所大青沟沙地实验站,沈阳110016 [2]中国科学院大学,北京100049

出　　处：《生态学杂志》2017年第11期3056-3063,共8页Chinese Journal of Ecology

基　　金：国家自然科学基金项目(41373087)资助

摘　　要：林下植物是森林生态系统的重要组分,在调节森林养分循环中起重要作用。本研究以科尔沁沙地樟子松人工林为对象,研究了林下植被去除对土壤微生物量、参与碳氮磷矿化的6种水解酶活性以及有效氮磷含量的影响。结果表明,林下植被去除显著降低了夏季(8月份)所有酶活性以及土壤微生物量碳、微生物量磷和有效磷含量,而在春季(5月份)仅显著降低了土壤β-乙酰氨基葡萄糖苷酶活性,对其他酶活性、微生物量以及有效氮磷含量无显著影响。结果表明,保留林下植被能有效促进樟子松人工林土壤微生物活性和土壤碳氮磷转化,维持植物生长期养分供应。Understory vegetation is an important component of forest ecosystems,which plays an important role in ecosystem nutrient cycling.The effects of understory removal on soil microbial biomass,activities of enzymes catalyzing organic carbon（C）,nitrogen（N）,and phosphorus（P）,and available N and P concentrations were examined in a nutrient-poor Pinus sylvestris var.mongolica plantation in Horqin Sandy Land.Understory removal significantly decreased microbial biomass C and P,available P concentrations,as well as all measured enzyme activities in summer（August）,but only decreased N-acetyl-β-D-glucosidase activity and did not influence microbial biomass,available nutrient concentrations and activities of other enzymes in spring（May）.These results suggested that preservation of understory vegetation could effectively improve soil microbial activity and accelerate mineralization of organic C,N and P,and thus maintain the nutrient supply in this nutrient-poor pine plantation.

关 键 词：林下植被去除 土壤酶活性 土壤微生物量 土壤有机碳 

分 类 号：S714.3[农业科学—林学]