Soil Quality Characteristics as Affected by Continuous Rice Cultivation and Changes in Cropping Systems in South China

被引:11
|
作者
Ren, Xiangning [1 ,2 ,3 ]
Chen, Feixiang [1 ,2 ,3 ]
Ma, Tao [1 ,2 ]
Hu, Yueming [1 ,2 ,3 ,4 ]
机构
[1] South China Agr Univ, Coll Nat Resources & Environm, Guangzhou 510642, Peoples R China
[2] Guangdong Prov Key Lab Land Use & Consolidat, Guangzhou 510642, Peoples R China
[3] South China Acad Nat Resources Sci & Technol, Guangzhou 510610, Peoples R China
[4] Qinghai Univ, State Key Lab Plateau Ecol & Agr, Xining 810016, Peoples R China
来源
AGRICULTURE-BASEL | 2020年 / 10卷 / 10期
关键词
CN ratio; carbon sequestration function; excessive fertilization; fertilizer use efficiency; paddy soil; soil organic matter; ORGANIC-CARBON ACCUMULATION; LONG-TERM FERTILIZATION; PADDY SOILS; SEQUESTRATION; HEALTH; NITRIFICATION; MANAGEMENT; STOCKS;
D O I
10.3390/agriculture10100443
中图分类号
S3 [农学(农艺学)];
学科分类号
0901 ;
摘要
This study was conducted to elucidate how changes in critical soil quality characteristics relate to continuous rice cultivation and changes in cropping systems and fertilization in South China over the time span 1980 to 2017. Soil pH, soil organic matter (SOM), total nitrogen (TN), available phosphorus (AP) and potassium (AK) were determined for the samples taken in 2017 and compared to results from the paired samples collected in 1980 by grouping all samples into four cropping systems: continuous paddy fields, new paddy fields developed from uplands, continuous uplands, and new uplands developed from paddy soils. The results show a significant increase in soil pH, AP and AK in all cropping systems, which was, however, coupled with low fertilizer use efficiency. Additionally, a significant increase in SOM came with new paddy soils, whereas a little SOM accumulation and a significantly weakened correlation of TN to SOM occurred in continuous paddy soils. Both low fertilizer use efficiency and deteriorated soil C sequestration function imply a sub-health status of continuous paddy soils. The changes in cropping systems and fertilization, which essentially resulted from expeditious economic growth, should be responsible for the dynamics of C and N and the consequences to soil quality. More experimental studies on balanced fertilization vs. local commonly used fertilization are suggested to probe the mechanisms underlying the C and N dynamics in paddy soils.
引用
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页码:1 / 11
页数:11
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