Scientia Agricultura Sinica ›› 2020, Vol. 53 ›› Issue (6): 1224-1233.doi: 10.3864/j.issn.0578-1752.2020.06.014

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• SPECIAL FOCUS: SOIL ACTIVE ORGANIC CARBON • Previous Articles     Next Articles

A Meta-Analysis of Long-Term Fertilization Impact on Soil Dissolved Organic Carbon and Nitrogen Across Chinese Cropland

YaLin LI1,XuBo ZHANG2(),FengLing REN1,Nan SUN1(),Meng XU2,MingGang XU1   

  1. 1 Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences/National Engineering Laboratory for Improving Quality of Arable Land, Beijing 100081
    2 Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences/Key Laboratory of Ecosystem Network Observation and Modeling, Beijing 100101
  • Received:2019-06-11 Accepted:2019-08-05 Online:2020-03-16 Published:2020-04-09
  • Contact: XuBo ZHANG,Nan SUN E-mail:zhangxb@igsnrr.ac.cn;sunnan@caas.cn

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Abstract:

【Objective】The objectives of this study were to assess the in?uence of long-term fertilization on the soil dissolved organic carbon (DOC) as well as soil dissolved organic nitrogen (DON) under various use types, cropping systems and soil pH, to give management guidance on how to increase soil carbon and nitrogen in Chinese Cropland. 【Method】In current study, 72 literatures including effects of long-term fertilization on the contents of DOC and DON in Chinese Cropland from 2000 to 2019 were selected (510 dataset for DOC and 208 dataset for DON). The meta-analysis was used to investigate how the magnitude of the DOC and DON contents response to mineral fertilizer and manure application at three aspects: use types, cropping systems and soil pH.【Result】At national scale, the contents of DOC and DON in the fertilized soils were significantly higher than those in the no fertilized soils (CK). The increments of DOC and DON contents in manure applied soils (60%和93%) were 4.6 and 3.2 times higher than those in the soils with mineral fertilizers (13% and 29%). Under different use types, fertilizer application can significantly increase the contents of DOC and DON in upland soil, and the increments of DOC and DON contents improved by manure in upland soil were higher than those in upland-paddy soil. Furthermore, manure application could increase the content of DOC in mono-cropping (85%) compared with no fertilizer (CK), which was significantly higher than that in double-cropping (38%). For the alkaline soils (pH>7.5), the increments of DOC and DON contents in the treatment with manure amendment (85% and 162%) were higher than those in the neutral (6.5＜pH＜7.5, 48% and 70%) and acidic soils (pH＜6.5, 32% and 61%) compared with no fertilizer (CK), respectively. 【Conclusion】In summary, the application of manure (only manure or combined with mineral fertilizer) could significantly increase the contents of DOC and DON, but the effects varied greatly across various use types, cropping systems, soil pH. Therefore, the appropriate conditions of soil and environment should be taken into account when applying manure.

Key words: long-term fertilization, soil dissolved organic carbon, soil dissolved organic nitrogen, use types, cropping systems, soil pH, Meta-analysis

Fig. 1

Distribution of soil dissolved organic carbon and soil dissolved organic nitrogen ln(x) is the value of the original data after in conversion. The curve is a Gaussian distribution fitted to frequency data and P＜0.01 suit for the distribution"

Table 1

The contents of DOC and DON under different fertilization treatments (mg·kg-1)"

项目
Item		 土壤溶解性有机碳DOC 土壤溶解性有机氮DON
不施肥CK 化肥 NPK 有机肥 OM 不施肥CK 化肥 NPK 有机肥 OM
样本数 No. 96 166 245 44 61 103
平均值 Mean 90.81b 97.19b 141.34a 12.36b 16.70b 24.39a
中值 Median 51.83 60.91 105.57 10.10 14.00 19.80
偏度 Skewness 2.10 1.27 1.16 1.80 1.86 1.56
峰度 Kurtosis 5.99 1.02 0.76 3.70 4.56 2.32
范围 Range 4.64—548.06 6.38—385.83 6.83—552.70 0.94—52.12 1.22—76.74 1.83—99.32

Fig. 2

Percent change of DOC content in response to mineral fertilizer and manure application compared to no fertilizer under different use types, cropping systems and soil pH Dots with error bars denote the percent change and 95% CI, respectively. The 95% CI that do not overlap zero line means significant difference between treatment and control. Numbers are the pairs of comparisons. The same as below"

Table 2

Difference of the increments (%) of DOC and DON contents in the same fertilization strategies under different use types, cropping systems and soil pH"

项目
Items		 土壤溶解性有机碳 DOC 土壤溶解性有机氮 DON
不施肥
CK		 化肥
NPK		 有机肥
OM		 不施肥
CK		 化肥
NPK		 有机肥
OM
利用方式
Use type		 水田 Paddy 23b 7b 34b 61ab 25a 84ab
水旱轮作 Upland-Paddy 26b 8ab 39b 35b 11a 52b
旱地 Upland 49a 18a 76a 92a 39a 136a
熟制
Cropping system		 一年一熟 Mono-cropping 56a 17a 85a 57a 23a 124a
一年两熟 Double-cropping 25b 10a 38b 52a 36a 87a
一年三熟 Triple-cropping 36ab 7a 56ab 30a 4a 55a
土壤pH
Soil pH
 pH＜6.5 23b 10b 32c 47b 25a 61b
6.5＜pH＜7.5 30b 11ab 48b 40b 8a 70b
pH>7.5 55a 19a 85a 111a 43a 162a

Fig. 3

Percent change of the content of DON in response to mineral fertilizer and manure application compared to no fertilizer under different use types, cropping systems and soil pH"

Fig. 4

Relationship between the content of DOC and DON"

Fig. 5

Relationship between the contents of DOC (a) or DON (b) and the amounts of annual manure carbon and nitrogen input"

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