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滇中高原云南松幼林和成熟林土壤呼吸及主要影响因子分析(PDF)

《南京林业大学学报(自然科学版)》[ISSN:1000-2006/CN:32-1161/S]

Issue:
2014年03期
Page:
71-76
Column:
研究论文
publishdate:
2014-05-15

Article Info:/Info

Title:
Soil respiration and its affecting factors in young and mature forests of Pinus yunnanensis in middle Yunnan plateau, China
Article ID:
1000-2006(2014)03-0071-06
Author(s):
ZHAO Jixia WANG Shaojun* CHEN Qibo WANG Yanxia XIONG Haoqin
College of Environmental Science and Engineering, Southwest Forestry University, Kunming 650224, China
Keywords:
Pinus yunnanensis plantation soil respiration soil temperature soil moisture soil nutrient
Classification number :
S714
DOI:
10.3969/j.issn.1000-2006.2014.03.014
Document Code:
A
Abstract:
In order to understand the characteristics of soil respiration(Rs)and its controlling factors in the young and mature forests of pine(Pinus yunnanensis)in Mopan Mountain National Forest Park of Yunnan province, we measured seasonal variations of Rs with Li-6400-09 chamber. The results were shown as follows: Rs fluctuated distinctly with seasonal patterns in the two sites. The rate of Rs in the mature forest(1.09-3.69 μmol/(m2·s))was significantly higher than that in the young forest(0.88-3.08μmol/(m2·s)). The contribution of soil moisture to Rs was significantly higher than that of soil temperature, which could be responsible for seasonal variation of Rs about 49.3%-79.4% in the young forest, and 63.3% -76.0% in the mature forest, respectively. The pH and soil nutrients had significant influences on Rs. The significant impacts of total P and pH on Rs were positive, and that of C/N was negative in two sites. Soil moisture had significantly positive relationship with total N and negative relationship with C/N in two sites, while the significant relationship between moisture content and soil total P as well as pH was only found in the mature pine forest. The results suggested that the severe drought in the southwest region led to the significant decrease of soil moisture, which may exert strong influence on Rs in the two sites. Moreover, soil moisture could have significant control on the spatial and temporal variation of Rs through its influence on soil permeability and soil nutrient in the young and mature pine forests.

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Last Update: 2014-05-15