典型自然带土壤氮磷化学计量空间分异特征及其驱动因素研究

发布时间：2018-02-25 06:06

本文关键词： 自然带植物生活型海拔梯度气候因子主控因素　出处：《土壤学报》2017年03期 　论文类型：期刊论文

【摘要】：植物生活型、地形及区域气候特征等对土壤养分的空间分布有着重要的影响。通过对我国典型自然带土壤氮磷化学计量与植物生活型、地形及气候因素间相互关系的研究,探讨了我国土壤氮磷的空间变异与分布特征及其主要控制因素。结果发现,5个自然带的土壤全氮(TN)和氮磷比(N/P)存在显著差异(p0.01);除温带荒漠带较低(0.47 mg g~(-1))外,土壤全磷(TP)均值总体变化不明显(p0.05)。在不同自然带区域内,TN、TP及N/P变化与海拔、温度及降水呈现出显著的线性和非线性二次相关,即表现出线性与单峰模式。暖温带落叶阔叶林带、温带草原带、温带荒漠带森林土壤中TN,以及青藏高原高寒植被带草本土壤中TP、温带荒漠带森林土壤的N/P主要受海拔因素的影响,而温带草原带草本植物的土壤TP则主要受降水的影响。同时,研究还发现,在多要素共同作用时,其影响程度也略有差异,温度和海拔作为控制因素影响亚热带常绿阔叶林带森林和温带草原带草本土壤TN变化,但前者受温度控制更为明显,后者则以海拔为主要驱动因素,而温带荒漠带草本土壤和森林土壤的TN主要受海拔和降水作用的影响,但以降水影响为主;亚热带常绿阔叶林带森林土壤TP,温带草原带、温带荒漠带和青藏高原高寒植被带草本土壤的N/P受植物生活型、地形及气候的共同影响,但程度略有不同,其中TP表现为降水温度海拔,而N/P为温度海拔降水。因此,在自然带和植物生活型的主控背景下,海拔、温度和降水的主控或交互作用直接驱动土壤氮磷及其化学计量特征的空间分异。
[Abstract]:Plant life forms, topography and regional climatic characteristics play an important role in the spatial distribution of soil nutrients. The relationships between soil nitrogen and phosphorus stoichiometry and plant life types, topography and climatic factors in typical natural zones of China are studied. The spatial variation and distribution characteristics of soil nitrogen and phosphorus in China and their main controlling factors were discussed. The results showed that there were significant differences in total nitrogen (TNN) and N / P ratio (N / P) among the five natural zones, except for the temperate desert zone (0.47 mg / g ~ (-1)). The total change of TPP in soil was not obvious (p 0.05). The changes of TNTP and N / P in different natural zones showed significant linear and nonlinear quadratic correlation with altitude, temperature and precipitation, that is, linear and single peak patterns, and deciduous broad-leaved forests in warm temperate zone. TNN in temperate steppe, temperate desert forest soil, TPin in herbaceous soil of alpine vegetation belt of Qinghai-Xizang Plateau, and N / P in temperate desert forest soil are mainly affected by elevation factors. However, the soil TP of herbaceous plants in temperate steppe zone is mainly affected by precipitation. Temperature and altitude were used as controlling factors to influence the change of TN in forest and herbaceous soil of subtropical evergreen broadleaved forest and temperate steppe, but the former was more obviously controlled by temperature, while the latter was mainly driven by altitude. The TN of herbaceous soil and forest soil in temperate desert zone is mainly affected by elevation and precipitation, but mainly by precipitation. The N / P of herbaceous soil in temperate desert zone and alpine vegetation belt of Qinghai-Xizang Plateau is influenced by plant life type, topography and climate, but the degree is slightly different. TP shows precipitation temperature and altitude, and N / P is temperature altitude precipitation. Under the background of natural belt and plant life type, the main or interactive effects of altitude, temperature and precipitation directly drive the spatial differentiation of soil nitrogen and phosphorus and their stoichiometric characteristics.
【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)联合资助~~
【分类号】：S151.95

【相似文献】