期刊
FOREST ECOLOGY AND MANAGEMENT
卷 400, 期 -, 页码 85-92出版社
ELSEVIER
DOI: 10.1016/j.foreco.2017.05.050
关键词
Carbon sequestration; Cropland conversion; Bedrock; Nitrogen accumulation; Plantation forest
类别
资金
- National Key Research and Development Program of China [2016YFC0502404]
- National Key Basic Research Program of China [2015CB452703]
- Chinese Academy of Sciences through its One-Hundred Talent Program [Y523101030]
- National Natural Science Foundation of China [41571295]
Afforestation is regarded as an effective way to sequester soil organic carbon (C) and hence to attenuate global warming. Nevertheless, so far mechanisms underlying the direction and magnitude of soil C pool variation following afforestation are not well understood. Here soil organic C, total nitrogen (N) and total phosphorus (P) pools in surface mineral soil (0-15 cm) were measured in cropland and plantation forest over two lithology types, i.e., limestone and clasolite, using a paired-site approach in a region of southwest China. The major objective was to test whether the effects of afforestation on soil C, N and P pools were affected by lithology. We found that lithology modulated the effect of afforestation on soil C or N pool, but not on soil P pool. Soil C pool was not altered by afforestation over limestone, but was significantly increased over clasolite (P < 0.001). Instead, soil N pool was significantly decreased by afforestation over limestone (P < 0.001), but was not altered over clasolite. Soil P pool was consistently decreased by afforestation regardless of lithology type (P < 0.05). The molar ratios among soil C, N and P were not affected by lithology, but were significantly elevated by afforestation (P < 0.01), indicating that soil C sequestration would increasingly be limited by soil N or P following afforestation. Our study suggests that afforestation effects on soil C and N pools may be controlled by lithology, and thus provides a new mechanism to explain the divergent responses of soil C and N following afforestation. (C )2017 Elsevier B.V. All rights reserved.
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