干湿度梯度及植物生活型对土壤氮磷空间特征的影响
发布时间：2018-11-25 07:21
【摘要】：通过对我国土壤氮磷含量及化学计量比值的分布特征研究,探讨了湿度梯度与植物生活型对土壤氮磷空间分布的影响。研究结果表明:中国陆地系统自然土壤氮、磷含量及氮磷比分别在0.02~8.78 g/kg,0.05~1.73 g/kg和0.06~9.85范围内变化,地形和气候因素对其空间变异性的影响均较为显著。干湿度梯度分带对土壤氮含量和氮磷比值的影响较磷含量更为明显,氮含量与氮磷比呈现出明显的梯度变化特征,表现出湿润区半湿润区干旱区半干旱区的规律,而磷含量变化不显著。在不同生活型植被土壤中,森林土壤氮磷的变化规律较灌木和草本土壤更为复杂;其植物磷平均含量低于全国平均值,说明森林生态系统植物受磷元素的限制作用与其较低的土壤磷含量供给有关。土壤氮磷含量和氮磷比与年均降水量和年均温度的相关性及逐步回归分析表明,土壤氮磷及其化学计量的变异性主要是受降水的影响。
[Abstract]:The effects of soil moisture gradient and plant life patterns on the spatial distribution of soil nitrogen and phosphorus were studied by studying the distribution characteristics of soil nitrogen and phosphorus contents and stoichiometric ratios in China. The results showed that the nitrogen, phosphorus content and the ratio of nitrogen to phosphorus in the natural soil of the terrestrial system of China varied within the range of 0.02g / kg / kg 0.05 g/kg and 0.06g / kg / kg respectively 1.73 g/kg and 0.066% 9.85, respectively. The effects of topography and climate on spatial variability are significant. The effect of dry and wet degree gradient zoning on soil nitrogen content and ratio of nitrogen and phosphorus is more obvious than that of phosphorus content. However, there was no significant change in phosphorus content. The variation of nitrogen and phosphorus in forest soil is more complex than that in shrub and herbaceous soil. The average phosphorus content of the plant was lower than the national average, which indicated that the restriction of plant phosphorus in forest ecosystem was related to the low phosphorus content in the soil. The correlation and stepwise regression analysis between soil nitrogen and phosphorus content and ratio of nitrogen and phosphorus to average annual precipitation and annual temperature showed that the variability of soil nitrogen and phosphorus and its stoichiometry was mainly influenced by precipitation.
【作者单位】： 云南师范大学高原湖泊生态与全球变化实验室;云南师范大学旅游与地理科学学院;云南师范大学云南省高原地理过程与环境变化重点实验室;
【基金】：国家自然科学基金项目(41461015) 云南省中青年学术技术带头人后备人才项目(2015HB029) 云南省水利厅项目(2014003)资助
【分类号】：S153
，
本文编号：2355275
[Abstract]:The effects of soil moisture gradient and plant life patterns on the spatial distribution of soil nitrogen and phosphorus were studied by studying the distribution characteristics of soil nitrogen and phosphorus contents and stoichiometric ratios in China. The results showed that the nitrogen, phosphorus content and the ratio of nitrogen to phosphorus in the natural soil of the terrestrial system of China varied within the range of 0.02g / kg / kg 0.05 g/kg and 0.06g / kg / kg respectively 1.73 g/kg and 0.066% 9.85, respectively. The effects of topography and climate on spatial variability are significant. The effect of dry and wet degree gradient zoning on soil nitrogen content and ratio of nitrogen and phosphorus is more obvious than that of phosphorus content. However, there was no significant change in phosphorus content. The variation of nitrogen and phosphorus in forest soil is more complex than that in shrub and herbaceous soil. The average phosphorus content of the plant was lower than the national average, which indicated that the restriction of plant phosphorus in forest ecosystem was related to the low phosphorus content in the soil. The correlation and stepwise regression analysis between soil nitrogen and phosphorus content and ratio of nitrogen and phosphorus to average annual precipitation and annual temperature showed that the variability of soil nitrogen and phosphorus and its stoichiometry was mainly influenced by precipitation.
【作者单位】： 云南师范大学高原湖泊生态与全球变化实验室;云南师范大学旅游与地理科学学院;云南师范大学云南省高原地理过程与环境变化重点实验室;
【基金】：国家自然科学基金项目(41461015) 云南省中青年学术技术带头人后备人才项目(2015HB029) 云南省水利厅项目(2014003)资助
【分类号】：S153
，
本文编号：2355275
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