黄土丘陵沟壑区不同植被区土壤生态化学计量特征  

Soil ecological stoichiometry under different vegetation area on loess hillygully region

作　　者：朱秋莲[1,2,3] 邢肖毅[1,3] 张宏[1,3] 安韶山[1,3] 

机构地区：[1]西北农林科技大学黄土高原土壤侵蚀与旱地农业国家重点实验室,杨陵712100 [2]西藏职业技术学院农林系,拉萨850030 [3]西北农林科技大学资源环境学院,杨凌712100

出　　处：《生态学报》2013年第15期4674-4682,共9页Acta Ecologica Sinica

基　　金：国家自然科学基金重点基金(41030532);国家自然科学基金面上项目(41171226);西北农林科技大学"优秀青年人才科研专项"(QN2011049)资助项目

摘　　要：以黄土丘陵沟壑区3个植被区(森林区、森林草原区、草原区)不同坡向土壤作为研究对象,对土壤有机C、全N、全P、全K含量及其化学计量特征进行了研究。结果表明,不同植被区、坡向和土层土壤养分含量及其化学计量特征均有明显不同。土壤有机C、全N变异性较大,全P、全K变异性较小。表层土壤养分含量显著高于底层土壤;同一土层之间有机C、全N含量变异性较大,全P、全K含量变异性较小。不同坡向之间养分含量不同,阴坡最大,阳坡最小。土壤养分含量受植被类型及植被盖度的影响,森林区>草原区>森林草原区。土壤C/N、C/P、C/K、N/P、N/K比都较稳定,C/N比的变化范围为5.65—12.57,平均值为9.44;C/P比的变化范围为3.62—17.32,平均值为8.15;C/K比的变化范围为0.10—0.55,平均值为0.26;N/P比的变化范围为0.43—1.38,平均值为0.86;N/K比的变化范围为0.01—0.05,平均值为0.03;P/K比值较稳定,为0.03。土壤有机C和全N极显著正相关,全N和全P极显著正相关。The objective of this study was to clarify the soil stoichiometric characteristics of three vegetation areas （forest area, forest-meadow area and meadow area） in loess hill and gully region. The soil at different slope aspects were selected to measure their organic carbon （C）, total nitrogen （N）, total phosphorous （P）, and total potassium （K） contents. The results indicated that there were obvious differences in soil nutrient contents and their stoichiometry under different vegetation areas and slope aspects. The C and N had larger variability, the P and K had smaller variability. Soil nutrient contents of surface were higher than the sub-layer soil. The C and N had larger variability than the P and K in the same soil layer. Sunny slope＇s nutrient content was the least. Soil nutrient contents were influenced by vegetation types and coverage. Soil C/N、C/P、C/K、N/P、N/K ratio were relatively stable, C/N ratio range from 5.65 to 12.57, and the mean value was 9.44; C/P ratio change from 3.62 to 17.32, the mean value was 8.15;C/K ratio change from 0.10 to 0.55, the mean value was 0.26; N/K ratio change from 0.01 to 0.05, the mean value was 0.03;P/K ratio was roughly unchanged at 0.03. The organic C was very significant correlation with the total N and there was significant correlation between total P and K.

关 键 词：化学计量特征 黄土丘陵沟壑区 植被区 坡向 

分 类 号：S153[农业科学—土壤学]