Effects of composition and habitat differences on litter decomposition and nutrient release characteristics of Abies georgei var. smithii in southeastern Tibet
DAI Songjia1, ZHOU Chenni2,3,4, DUAN Fei2,3,4, FANG Jiangping2,3,4, LONG Chunlin1
1. College of Life and Environmental Sciences, Minzu University of China, 100081, Beijing, China; 2. Research Institute of Tibet Plateau Ecology, Tibet Agriculture & Animal Husbandry University, 860000, Nyingchi, Tibet, China; 3. Key Laboratory of Forest Ecology in Tibet Plateau(Tibet Agriculture & Animal Husbandry University), Ministry of Education, 860000, Nyingchi, Tibet, China; 4. United Key Laboratories of Ecological Security, Tibet Autonomous Region, 860000, Nyingchi, Tibet, China
Abstract：[Background] Litter decomposition is one of the important links of material cycle and energy flow in forest ecosystem. There are few reports on the litter decomposition and nutrient release of typical natural dark coniferous forests in Tibet. The purpose of this study is to provide basic data and theoretical basis for in-depth understanding of the material cycle process of forest ecosystem in high altitude and cold environment. [Methods] Three types of samples (leaf sample, natural sample, and branch sample) from 3 sample plots (in forest, outside forest and beside forest) were selected in Sejila Mountain, Tibet. The litter of Abies georgei var. smithii forest was collected in December 2016. At the beginning of each month in 2017, 3 bags of litters were collected from each sample plot, and the litter retention rate and monthly decomposition rate were calculated. The content of C, N, P, and K was determined by concentrated sulfuric acid-potassium dichromate method, Kjeldahl method, molybdenum blue colorimetric spectrophotometry, flame spectrophotometry. [Results] 1) The monthly decomposition rate of litter was leaf sample (2.21%) > natural sample (2.17%) > branch sample (1.70%), and IF (2.17%) > OF (1.94%) > BF (1.93%). 2) The decomposition time of 95% of natural sample, leaf sample and branch sample litter in the same habitat with different components was 8.96 years, 10.02 years and 13.18 years. 3) The decomposition time of 95% of IF, OF, and BF with the same component was 8.96 years, 10.01 years and 10.84 years. 4) The release rates of C and N were significantly positively correlated with the components, while the release rates of P and K were negatively correlated with the components. 5) The release rates of C, N, P and K were significantly or very significantly and positively correlated with the habitat. 6) There were significant differences in C/N, C/P and N/P among different habitats. 7) There was a very significant negative correlation between C/N and habitat, no significant correlation between C/P and habitat, and an extremely significant positive correlation between N/P and habitat. [Conclusions] Different litter components and habitat conditions have significant effects on litter decomposition rate and nutrient release characteristics, and the effects of components and habitats vary.
代松家, 周晨霓, 段斐, 方江平, 龙春林. 组分和生境差异对藏东南原始冷杉林凋落物分解和养分释放特征的影响[J]. 中国水土保持科学, 2020, 18(6): 72-80.
DAI Songjia, ZHOU Chenni, DUAN Fei, FANG Jiangping, LONG Chunlin. Effects of composition and habitat differences on litter decomposition and nutrient release characteristics of Abies georgei var. smithii in southeastern Tibet. SSWC, 2020, 18(6): 72-80.
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2020, Vol. 18 
