干旱区生态环境知识资源中心(Arid): 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

Arid

	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
其他题名	Study on Spatial Variability and Driving Factors of Stoichiometry of Nitrogen and Phosphorus in Soils of Typical Natural Zones of China
	卢同平; 张文翔; 牛洁; 林永静; 武梦娟
来源期刊	土壤学报
ISSN	0564-3929
出版年	2017
卷号	54 期号:3 页码:682-692
中文摘要	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(p< 0.01);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(p>0.05)。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。
英文摘要	【Objective】 Nitrogen (N) and phosphorus (P) are two important nutrients and play important role in sustaining plant growth in natural ecosystems,and changes in structure and function of an ecosystem may reflect in stoichiometric characteristics of the elements in the soil. Natural zone, life form and elevation are major factors affecting soil nutrients in all climatic zones. Therefore, the study on stoichiometric characteristics on large spatial scales may help explore distribution characteristics of soil nutrients and driving factors of the evolution of soil nutrients,and provide important reference to studies to understand in depth global biogeochemical recycling of the soil nutrients and simulate regional responses to global change. [Method] From the literature available regarding soil stoichiometry in the subtropical evergreen broad-leaved forest zone (SEB), warm temperate deciduous broad-leaved forest zone (WTD),temperate steppe zone (TSZ),temperate desert zone (TDZ) and Qinghai-Tibet Plateau Alpine vegetation zones (QST), a total of 594 data of N and P contents in natural soils, 0-20 cm in depth of various regions of the country and their stoichiometric analyses, covering a time span of 15 years were acquired using the aid of electronic search engines. Statistic analysis of the collected data were performed using methods of one-way analysis of variance (ANOVA),least significant difference (LSD),Spearman correlation coefficient analysis, and multivariate linear and non-linear autoregressive modeling (MAR),to explore distribution and variability of soil total nitrogen (TN) and total phosphorus (TP) and their stoichiometry in soil in relation to elevation, temperature and precipitationin the SEB, WTD, TSZ, TDZ and QST.【Result】 Results show that soil TN and N/P varied significantly from natural zone to natural zone, but soil TP did not as much. The average TN content was 2.35 mg g~(-1), 1.13 mg g~(-1), 1.07 mg g~(-1), 3.59 mg g~(-1), and 5.66 mg g~(-1); the average TP content 0.80 mg g~(-1), 0.82 mg g~(-1), 0.75 mg g~(-1), 0.47 mg g~(-1), and 0.75 mg g~(-1); and the average N/P 4.04, 2.26, 2.49, 6.71, and 7.73 in the SEB, WTD, TSZ, TDZ and QST, respectively. In all the five zones, TN, TP and N/P varied with elevation, displaying a non-linear secondary relationship, and a single peak pattern. However, in the SEB and TSZ soil TN was mainly affected by temperature and elevation, and the impact of elevation was more significant in the TSZ. In the TDZ soil TN was influenced by elevation and precipitation. However, in the WTD and QST, soil TN was not so much affected by the three factors. In the SEB, soil TP was jointly affected by the three natural factors, which, however, followed a declining order of precipitation > temperature > elevation in extent, and in the WTD and TDZ and QST soil TP was mainly affected by elevation, while in the TSZ, precipitation was the dominant factor that affects soil TP. Furthermore, in the SEB, soil N/Pwas more affected by by precipitation than by elevation, and in the TSZ, TDZ and QST it was affected jointly by all the three factors, temperature, precipitation and elevation, while in the TDZ, elevation was the key factor affecting soil N/P and in the TSZ, temperature and precipitation were, but differed in degree of the effect.
中文关键词	自然带 ; 植物生活型 ; 海拔梯度 ; 气候因子 ; 主控因素
英文关键词	Natural zone Plant life form Elevation gradient Climatic factors Dominant control factors
语种	中文
国家	中国
收录类别	CSCD
WOS类目	GEOSCIENCES MULTIDISCIPLINARY
WOS研究方向	Geology
CSCD记录号	CSCD:6001709
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/236767
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, 昆明, 云南 650500, 中国
推荐引用方式 GB/T 7714	卢同平,张文翔,牛洁,等. 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[J],2017,54(3):682-692.
APA	卢同平,张文翔,牛洁,林永静,&武梦娟.(2017).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.土壤学报,54(3),682-692.
MLA	卢同平,et al."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".土壤学报 54.3(2017):682-692.