Changes in soil organic carbon and nitrogen mineralization and their temperature sensitivity in response to afforestation across China's Loess Plateau

被引：29

作者：

Rong, Guohua ^{[1
,2
]}

Zhang, Xuejiao ^{[1
,2
]}

Wu, Hongyu ^{[1
,2
]}

Ge, Nannan ^{[2
]}

Yao, Yufei ^{[3
]}

Wei, Xiaorong ^{[1
,2
,4
]}

机构：

[1] Northwest A&F Univ, Coll Nat Resources & Environm, Yangling 712100, Shaanxi, Peoples R China

[2] Northwest A&F Univ, State Key Lab Soil Eros & Dryland Faming Loess Pl, Yangling 712100, Shaanxi, Peoples R China

[3] Northwest Univ, Coll Urban & Environm Sci, Shaanxi Key Lab Earth Surface Syst & Environm Car, Xian 710127, Peoples R China

[4] CAS Ctr Excellence Quaternary Sci & Global Change, Xian 710061, Peoples R China

来源：

CATENA | 2021年 / 202卷

基金：

中国国家自然科学基金;

关键词：

Land-use change; Afforestation; Carbon and nitrogen mineralization; Temperature sensitivity; Soil texture; LAND-USE CHANGE; MATTER DECOMPOSITION; MICROBIAL BIOMASS; N MINERALIZATION; GREEN PROGRAM; FOREST; TEXTURE; RESPIRATION; SEQUESTRATION; DYNAMICS;

D O I：

10.1016/j.catena.2021.105226

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Afforestation on abandoned cropland has great potential to increase soil organic carbon (OC) and nitrogen (N). Identifying the effect of afforestation on mineralization of OC and N as well as their temperature sensitivity at large spatial and temporal scales is essential to understand soil OC and N dynamics. In this study, we measured mineralization of soil OC and N at standard temperatures (15 and 25 degrees C) by laboratory incubation, and calculated their temperature sensitivity (Q(10)). Soil samples were collected from cropland (0 years, selected as a control) and adjacent woodlands with different afforestation age (10, 20 and 30 years) at five sites from north to south on China's Loess Plateau. The objectives were to understand how long-term afforestation affects OC and N mineralization and their Q(10) and whether such effects depend on afforestation age and soil texture. The results showed that afforestation increased OC and N mineralization, but this effect was not affected by afforestation age (10-30 years). The Q(10) of OC and N mineralization increased in the first 10 years of afforestation but decreased in the late stage. Furthermore, the increases of OC and N mineralization by afforestation were higher at sites with fine-textured soils than those at sites with coarse-textured soils. However, the Q(10) increased at sites with a relatively high sand content but decreased or remained unchanged at sites with a relatively high clay content. The changes in OC and N mineralization and their Q(10) were related to soil OC and N contents, pH and clay content. Overall, we concluded that long-term afforestation would contribute to the stability of soil OC and N in afforested ecosystems. Soil texture is an important factor controlling OC and N mineralization and their Q(10), and should be considered when predicting soil OC and N dynamics in response to temperature change in different landscapes.

引用

页数：9

共 79 条

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