1. 北方林草交错带土壤生态化学计量特征及其影响因素.
- Author
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姚彩萍, 陈银萍, 李玉强, 陈 云, 曹雯婕, and 林会全
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RESTORATION ecology , *SOIL restoration , *GRASSLAND soils , *SOIL quality , *SOIL sampling , *CARBON in soils , *GRASSLAND restoration - Abstract
This study aimed to explore the ecological stoichiometric characteristics of soil carbon ( C ), nitrogen ( N), and phosphorus( P) in a northern forest-grass ecotone and evaluate its response to influencing factors to reveal the limiting factors of soil nutrients and the driving mechanism of ecosystem evolution in the region. Sampling points were set up at an interval of 25 km from north to south in the study area for field investigation and soil sample collection. The soil ecological stoichiometric characteristics and their relationship with environmental factors were analyzed using statistics and redundancy analysis( RDA). The results showed that: the average concentration of soil organic carbon( SOC), total nitrogen( TN), and total phosphorus( TP) in the 0-20 cm soil layer was 36.76, 2.65, and 0.60 g • kg-1, respectively, and the C N P ratio was 61:4:1. In the 20-30 cm soil layer, the contents of SOC, TN, and TP decreased, they were 27.95, 2.30, and 0.55 g•kg-1, respectively, and the C: N: P ratio was 51:4:1. The region was characterized by N deficiency. For different vegetation types, the contents of SOC, TN, and TP were in the following order: forest>forest and sandy grassland>sandy grassland, and there were significant differences among the three vegetation areas( P<0.05). The contents of SOC, TN, and TP increased with an increase in precipitation, altitude, and temperature. In the 0-20 cm soil layer, the C: N, C: P, and N: P ratios increased with an increase in precipitation and altitude, but decreased with an increase in temperature. In the 20-30 cm soil layer, C: P and N: P ratios increased with an increase in precipitation and altitude but did not change significantly with temperature. C: N ratio increased with an increase altitude but did not change significantly with precipitation and temperature. RDA indicated that the main driving factor of soil ecological stoichiometry in the area was vegetation, followed by soil, terrain, and climate. The results revealed the response mechanism of soil ecological stoichiometry to influencing factors, and this is an important guide to ecological restoration and soil quality health development in forest-grassland ecotones in northern China. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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