|Table of Contents|

Content and ecological stoichiometry characteristics of soil carbon, nitrogen, and phosphorus in artificial grassland under different restoration years(PDF)

Chinese Journal of Applied & Environmental Biology[ISSN:1006-687X/CN:51-1482/Q]

Issue:
2019 01
Page:
38-45
Research Field:
Articles
Publishing date:

Info

Title:
Content and ecological stoichiometry characteristics of soil carbon, nitrogen, and phosphorus in artificial grassland under different restoration years
Author(s):
OU Yansheng WANG Xia** LI Jia JIA Haixia ZHAO Yunfei HUANG Zheng & HONG Miaomiao
Key Laboratory of Environmental Pollution Prediction and Control of Gansu Province, Key Laboratory of Western China’s Environmental Systems (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China
Keywords:
restoration years artificial grassland carbon nitrogen and phosphorus ecological stoichiometry
CLC:
S812.2
PACS:
DOI:
10.19675/j.cnki.1006-687x.2018.05005
DocumentCode:

Abstract:
Using the methods of comparative analysis and substituting temporal serial with spatial serial, we investigated the artificial grassland soil with different recovery years in Luoyugou watershed in the hilly gully region of loess plateau. In particular, we analyzed the content of carbon, nitrogen, and phosphorus and their ecological stoichiometric characteristics and discussed their relationships with soil physical and chemical properties. The results showed that with the increase of restoration years, the content of organic carbon, total nitrogen, and total phosphorus in artificial grassland increased, and the organic carbon content remained stable after eight years. The soil C/N ratio in artificial grassland first showed an increasing trend and then a decreasing trend, and the variation range was 10.66–13.62, which was equal to the national soil C/N average level. The soil C/P and N/P ratios showed an increasing-decreasing-increasing trend, and the ranges of variation were 9.19–13.18 and 0.82–1.17, respectively, which was lower than the corresponding national level. A significant correlation was observed between soil organic carbon, total nitrogen, total phosphorus and soil moisture content, density, porosity, pH. A significant positive correlation was observed between soil organic carbon, total nitrogen, and total phosphorus (P < 0.01). The C/N ratio had a significant negative correlation with total nitrogen, but not with organic carbon (P < 0.01), indicating that it was significantly affected by the total nitrogen content. The C/P ratio was positively correlated with organic carbon, but not with total phosphorus (P < 0.01), indicating that it was mainly controlled by the organic carbon content. The N/P ratio was positively correlated with total nitrogen and total phosphorus (P < 0.01), indicating that it was significantly affected by total N and P content. Therefore, N and P were found to be the main restricted nutrients in this area. Planting artificial grassland not only changes soil structure and nutrient content, but also plays an active role in maintaining soil and water, regulating climate, and so on. It can be used as one of the effective measures for grassland ecological restoration in the Luoyugou Basin.

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Last Update: 2019-02-25