数字农科院2.0

Intensive Organic Vegetable Production Increases Soil Organic Carbon But With A Lower Carbon Conversion Efficiency Than Integrated Management

文献类型： 外文期刊

作者： Zhao, Y; Wu, SX; Bol, R; Bughio, MA; Wu, WL; Hu, YC; Meng, FQ

作者机构：

关键词： carbon conversion efficiency; delta C-13; greenhouse vegetable production; organic carbon stock; organic fertilizer; particle-size fraction

期刊名称： JOURNAL OF PLANT NUTRITION AND SOIL SCIENCE

ISSN： 1436-8730

年卷期： 2020 年 183 卷 2 期

页码：

收录情况： JCR（2021版）

摘要： Intensive vegetable production in greenhouses has rapidly expanded in China since the 1990s and increased to 1.3 million ha of farmland by 2016, which is the highest in the world. We conducted an 11-year greenhouse vegetable production experiment from 2002 to 2013 to observe soil organic carbon (SOC) dynamics under three management systems, i.e., conventional (CON), integrated (ING), and intensive organic (ORG) farming. Soil samples (0-20 and 20-40 cm depth) were collected in 2002 and 2013 and separated into four particle-size fractions, i.e., coarse sand (> 250 mu m), fine sand (250-53 mu m), silt (53-2 mu m), and clay (< 2 mu m). The SOC contents and delta C-13 values of the whole soil and the four particle-size fractions were analyzed. After 11 years of vegetable farming, ORG and ING significantly increased SOC stocks (0-20 cm) by 4008 +/- 36.6 and 2880 +/- 365 kg C ha(-1) y(-1), respectively, 8.1- and 5.8-times that of CON (494 +/- 42.6 kg C ha(-1) y(-1)). The SOC stock increase in ORG at 20-40 cm depth was 245 +/- 66.4 kg C ha(-1) y(-1), significantly higher than in ING (66 +/- 13.4 kg C ha(-1) y(-1)) and CON (109 +/- 44.8 kg C ha(-1) y(-1)). Analyses of C-13 revealed a significant increase in newly produced SOC in both soil layers in ORG. However, the carbon conversion efficiency (CE: increased organic carbon in soil divided by organic carbon input) was lower in ORG (14.4%-21.7%) than in ING (18.2%-27.4%). Among the four particle-sizes in the 0-20 cm layer, the silt fraction exhibited the largest proportion of increase in SOC content (57.8% and 55.4% of the SOC increase in ORG and ING, respectively). A similar trend was detected in the 20-40 cm soil layer. Over all, intensive organic (ORG) vegetable production increases soil organic carbon but with a lower carbon conversion efficiency than integrated (ING) management.

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