亚热带天然林转换为锥栗林后土壤胞外酶活性及其化学计量特征  

Soil extracellular enzyme activities and their stoichiometric characteristics following the conversion of natural forests to Castanea henryi plantation in subtropical region

作　　者：毛娇艳 杨青 郭琦玲 孙嘉雯 施秀珍 王建青 MAO Jiaoyan;YANG Qing;GUO Qi-ling;SUN Jiawen;SHI Xiuzhen;WANG Jianqing(Institute of Geography,Fujian Normal University,Fuzhou 350012,China;School of Geographical Sciences/School of Carbon Neutrality Future Technology,Fujian Normal University,Fuzhou 350012,China;Key Laboratory for Humid Subtropical Eco-Geographical Processes of Ministry of Education,Fujian Normal University,Fuzhou 350012,China;Test Center of Agricultural Research of Fujian Province Department of Science and Technology,Fuzhou 350012,China)

机构地区：[1]福建师范大学地理研究所,福州350117 [2]福建师范大学地理科学学院/碳中和未来技术学院,福州350117 [3]福建师范大学湿润亚热带生态-地理过程教育部重点实验室,福州350117 [4]福建省科技厅农牧业科研中试中心,福州350012

出　　处：《应用生态学报》2025年第2期481-488,共8页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金项目(32271679);福建省自然科学基金项目(2023R1002004,2024J09029)资助。

摘　　要：本文研究了亚热带天然针阔混交林转换为锥栗人工林后土壤胞外酶活性及其化学计量特征。结果表明:天然林转换为锥栗人工林后显著降低了土壤胞外酶活性,纤维素水解酶(CBH)、β-葡萄糖苷酶(βG)、β-N-乙酰氨基葡萄糖苷酶(NAG)、酸性磷酸酶(AP)分别显著降低了70.6%、53.5%、82.3%和76.2%。冗余分析表明,土壤pH、土壤含水量、硝态氮和速效磷是造成土壤胞外酶活性变化的主要因素。4种土壤胞外酶活性与微生物生物量碳均呈显著正相关,与硝态氮均呈显著负相关;NAG和AP活性与土壤含水率、铵态氮、土壤总碳呈显著正相关;βG活性与土壤总碳呈显著正相关。土壤胞外酶C∶N和N∶P活性比受土壤pH、土壤含水量、微生物生物量碳、硝态氮、铵态氮、速效磷、土壤总碳的显著影响,C∶P活性比与微生物生物量碳、铵态氮、土壤总碳呈显著正相关。天然林转换为锥栗人工林后导致土壤胞外酶C∶N∶P活性比从1∶1∶1.66增长到1∶1∶2,矢量角度大于45°,但矢量长度减小。综上,天然林转换为锥栗人工林后降低了土壤胞外酶活性,加剧了亚热带森林土壤磷限制。We investigated the responses of soil extracellular enzyme activities and stoichiometric characteristics following the conversion of mixed conifer-broadleaf forest to Castanea henryi plantation in the subtropical region. The results showed that the conversion from natural forest to C. henryi plantation significantly reduced activities of cellulose hydrolase(CBH), β-D-glucosidase(βG), β-N-acetylglucosaminidase(NAG), acid phosphatase(AP) by 70.6%, 53.5%, 82.3%, and 76.2%, respectively. Redundancy analysis indicated that soil pH, soil water content, nitrate nitrogen and available phosphorus were the primary factors driving change in soil extracellular enzyme activities. Soil extracellular enzyme activities were positively correlated with microbial biomass carbon and negatively correlated with nitrate nitrogen. NAG and AP activities were significantly positively correlated with soil moisture, ammonium nitrogen, and total soil carbon. βG activities were significantly positively correlated with total carbon. Soil extracellular enzyme C:N and N:P activity ratios were significantly affected by soil pH, soil moisture, microbial biomass carbon, nitrate nitrogen, ammonium nitrogen, available phosphorus, and total soil carbon, while the C:P activity ratio was positively correlated with soil microbial biomass carbon, ammonium nitrogen, and total carbon. Soil extracellular enzyme C:N:P activity ratio increased from 1:1:1.66 to 1:1:2 following the conversion, with a vector angle greater than 45° and a decrease in the vector length. In summary, the conversion of natural forest to C. henryi plantation led to a significant reduction in soil extracellular enzyme activities and exacerbated phosphorus limitation in subtropical forest soils.

关 键 词：土地利用方式 胞外酶活性 酶化学计量比 锥栗人工林 

分 类 号：S714[农业科学—林学]