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  

Soil respiration and its affecting factors in young and mature forests of Pinus yunnanensis in middle Yunnan plateau,China

作　　者：赵吉霞[1] 王邵军[1] 陈奇伯[1] 王艳霞[1] 熊好琴[1] 

机构地区：[1]西南林业大学环境科学与工程学院,云南昆明650224

出　　处：《南京林业大学学报（自然科学版）》2014年第3期71-76,共6页Journal of Nanjing Forestry University：Natural Sciences Edition

基　　金：国家林业公益性行业科研专项项目(201204101-10)

摘　　要：为探明云南磨盘山国家森林公园云南松林幼林与成熟林土壤呼吸特征及其主要调控因子，采用Li-6400-09土壤呼吸室测定土壤呼吸速率的季节动态。结果表明：云南松幼林和成熟林土壤CO2流动速率呈明显的季节波动，且成熟林土壤呼吸（1．09～3．69μmol/（m2·s））显著高于幼龄林（0.88～3．08μmol/（m2·s））。土壤水分是影响土壤呼吸季节动态的重要影响因子，土壤含水量对土壤呼吸速率的影响显著大于土壤温度，不同影响因子中，含水量成熟林土壤呼吸的影响占全部影响的63.3％～76．0％，对幼林的49.3％～79.4％。 pH与土壤养分对土壤呼吸也会产生一定影响。2种林分中，土壤呼吸速率与pH、全P均呈显著或极显著正相关，与土壤C/N极显著负相关；同时，土壤含水量与全N极显著正相关，与C/N显著或极显著负相关；但土壤含水量与土壤pH、全P仅在成熟林中呈显著或极显著正相关。因此，西南地区严重干旱导致土壤含水量的减少已成为土壤呼吸速率的主要限制因子，土壤水分能够通过影响土壤通透性、土壤有机质以及N、P 等养分含量，从而调控云南松成熟林和幼林土壤呼吸的时空动态。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 （1.09-3.69μmol/（m2·s）） was significantly high-er 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 sig-nificant 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 tem-poral variation of Rs through its influence on soil permeability and soil nutrient in the young and mature pine forests.

关 键 词：云南松林 土壤呼吸 土壤温度 土壤含水量 土壤养分 

分 类 号：S714[农业科学—林学]