三工河流域两种琵琶柴群落凋落物分解与周转研究  

Litterfall decomposition and turnover of two Reaumuria soongorica communities in the Sangong River basin

作　　者：汪依妮 柳鑫 王昭懿 帅洪刚 金宝成 赵学春 WANG Yini;LIU Xin;WANG Zhaoyi;SHUAI Honggang;JIN Baocheng;ZHAO Xuechun(Guizhou Grassland Technology Test and Extension Station,Guiyang 550025,China;College of Animal Science,Guizhou University,Guiyang 550025,China;Institute of Botany,Chinese Academy of Sciences,Beijing 100093,China)

机构地区：[1]贵州省草地技术试验推广站,贵阳550025 [2]贵州大学动物科学学院,贵阳550025 [3]中国科学院植物研究所,北京100093

出　　处：《生态科学》2023年第3期92-97,共6页Ecological Science

基　　金：贵州省科技计划项目(黔科合支撑[2020]1Y076,[2021]一般503号);贵州省科技重大专项(黔科合重大专项字[2016]3002号);贵州省草地生态畜牧业人才基地(RCJD2018-13)。

摘　　要：凋落物是植物与土壤间物质和能量转换的载体,是陆地生态系统养分循环的重要环节。本文于2010年和2011年生长季(5月—10月)内,利用凋落物收集器和分解袋法研究三工河流域两处长势不同的琵琶柴群落凋落物的生产、分解和周转对土壤因子的响应。结果表明,两个群落凋落物的月产量呈先增加后降低的趋势,分别在7月和8月达到最大值。群落1和群落2的年凋落物年产量差异显著,分别为25.42 g·m^(–2)·a^(–1)和34.05 g·m^(–2)·a^(–1),凋落物对土壤有机碳的补充量分别为11.81 g·m^(–2)·a^(–1)和17.65 g·m^(–2)·a^(–1)。两个群落的凋落物均在初期分解较快,随后分解速率不断降低,群落1和群落2的分解1年后的残留率分别为71.81%和75.60%。当凋落物分解量达到50%和95%时,群落1分别需要2.52年和14.64年,群落2分别需要3.69年和20.13年。群落1和群落2的周转速率分别为1.21次·a^(–1)和0.98次·a^(–1)。本研究结果预示,土壤含水量、pH和容重是影响凋落物分解的主导因子。Litterfall is the carrier of material and energy conversion between plants and soil,and an important link of the nutrient cycle in terrestrial ecosystem.In this paper,during the 2010 and 2011 growing seasons(May-October),we studied the production,decomposition and turnover of the litterfall of two Reaumuria soongorica communities,located in the Sangong River basin with different growth,as well as their association with soil factors and responses.In the research process,we used the collector and decomposition bag method.The results showed that the monthly litterfall production of the two communities increased initially,and decreased thereafter with time.Their production reached the maximum value in July and August,respectively.The annual litterfall production of community 1 and community 2 was 25.42 g·m^(–2)·a^(–1)and 34.05 g·m^(–2)·a^(–1),respectively.The supplement amount of litterfall to soil organic carbon was 11.81 g·m^(–2)·a^(–1)and 17.65 g·m^(–2)·a^(–1),respectively.The residual rate was 71.81%and 75.60%after a year's decomposition in community 1 and community 2,respectively.When the litterfall decomposition reached 50%and 95%,it took 2.52 and 14.64 years for community 1 and 3.69 and 20.13 years for community 2,respectively.The turnover of litterfall in community 1 and community 2 was 1.21 times·a^(–1)and 0.98 times·a^(–1),respectively.Soil water content,pH and bulk density were the main factors affecting the decomposition of litterfall in the two communities.

关 键 词：琵琶柴群落 凋落物 分解 周转 土壤因子 

分 类 号：Q948[生物学—植物学] Q14