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

doi:10.16843/j.sswc.2020.06.009

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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.

Key words： Abies georgei var. smithii forest litter decomposition rate nutrient release

Received: 09 December 2019

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S714

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	DAI Songjia
	ZHOU Chenni
	DUAN Fei
	FANG Jiangping
	LONG Chunlin

Cite this article:

DAI Songjia,ZHOU Chenni,DUAN Fei, et al. Effects of composition and habitat differences on litter decomposition and nutrient release characteristics of Abies georgei var. smithii in southeastern Tibet[J]. SSWC, 2020, 18(6): 72-80.

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http://journal12.magtechjournal.com/Jweb_stbc/EN/10.16843/j.sswc.2020.06.009 OR http://journal12.magtechjournal.com/Jweb_stbc/EN/Y2020/V18/I6/72

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