NDLI: Changes in topsoil organic carbon of croplands in mainland China over the last two decades

Content Provider	Springer Nature Link
Author	Huang, Yao Sun, Wenjuan
Copyright Year	2006
Abstract	By searching literature databases, we obtained more than 200 articles published since 1993 that related to the measurements of topsoil organic carbon (SOC) in different regions. To objectively evaluate the changes in the SOC over the last two decades, we selected 132 representative articles from these documented articles. More than sixty thousand soil samples and/or sampling sites were included in the selected articles. Results from analyzing these data sets indicated that the concentration of SOC increased in 53%–59%, decreased in 30%–31% and stabilized in 4%–6% of the national croplands, respectively. A further investigation showed that the total increment of SOC in Chinese croplands ranged from 311.3 Tg to 401.4 Tg. In terms of administrative region, significant increase occurred in eastern and northern China and decrease in northeastern China, respectively. When evaluated by soil great groups, the SOC increased considerably in paddy soils and fluvo-aquic soils and reduced conspicuously in black soils. The increase of SOC is attributed to the amendments of crop residues and organic manure, the augment of synthetic fertilizer application and the optimal combination of nutrients, and the development of no-tillage and reduced-tillage practice. Water loss and soil erosion and low input induced a great decrease of the SOC in black soils. In order to effectively enhance soil C sequestrations and to greatly control the SOC reduction in northeastern China, future efforts should be made in developing new techniques, training farmers and consummating the policy of governmental compensation, by which the application of crop straw, the improvement of fertilization, the practice of no-tillage and reduced-tillage, and the control of water loss and soil erosion could be further realized. To respond to the increasing pressure from the Kyoto Protocol thenceforward, four aspects were further addressed for future research needs, including the quantification of SOC storage in the Second State Soil Survey and at present, the understanding of control mechanisms in both anthropogenic and non-anthropogenic causes that determine SOC dynamics, the investigation of options that can effectively enhance SOC sequestration and/or reduce SOC loss, and the assessments of potentials and the likely SOC dynamics in the future on a national scale.
Starting Page	1785
Ending Page	1803
Page Count	19
File Format	PDF
ISSN	10016538
Journal	Chinese Science Bulletin
Volume Number	51
Issue Number	15
e-ISSN	18619541
Language	English
Publisher	Science in China Press
Publisher Date	2006-01-01
Publisher Place	Beijing
Access Restriction	Subscribed
Subject Keyword	China croplands topsoil organic carbon change Science Chemistry/Food Science Geosciences Life Sciences Physics Engineering
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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