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Amounts of Stubbles Left in Paddy Fields: Evaluation from the Viewpoints of C Sequestration and Soil Fertility

文献类型： 外文期刊

作者： Liu, Jun-Jie 1 ; Zou, Ping 2 ; Wang, Guang-hua 1 ; Fu, Jian-rong 2 ; Ando, Ho 3 ; Kimura, Makoto 4 ;

作者机构： 1.Chinese Acad Sci, Northeast Inst Geog & Agroecol, Key Lab Mollisols Agroecol, Harbin 150081, Peoples R China

2.Zhejiang Acad Agr Sci, Inst Environm Resources Soil & Fertilizer, Hangzhou 310021, Zhejiang, Peoples R China

3.Yamagata Univ, Fac Agr, Tsuruoka, Yamagata 9978555, Japan

4.Nagoya Univ, Fac Agr, Chikusa Ku, Nagoya, Aichi 4648601, Japan

关键词： biomass;C sequestration;corn stubble;rice straw;rice stubble

期刊名称：PHILIPPINE AGRICULTURAL SCIENTIST （ 影响因子：0.25； 五年影响因子：0.388 ）

ISSN： 0031-7454

年卷期： 2017 年 100 卷 1 期

页码：

收录情况： SCI

摘要： Plant residues are the main source of organic materials maintaining soil fertility in paddy fields, among which rice stubble has been disregarded of its importance so far. This study highlighted the great amount of rice stubbles retained in paddy fields in comparison with that of corn stubbles. Height of rice stubbles was measured in paddy fields under harvesting methods by hand and harvesters around Harbin and Shaoxing City, China. The height of stubbles above the ground was 5.0 +/- 1.7 cm, 10.1 +/- 2.3 cm and 28.7 +/- 8.4 cm for rice fields harvested by hand and harvesters that left rice straw in the fields without and with cutting it into segments, corresponding to 18-25%, 25-32% and 47-60% of total top part biomass (excluding ears), respectively. These results suggested that the biomass of stubbles left in paddy fields by the second-type harvesters was larger than that of rice straw. Mechanization in harvesting rice plants was 73% in 2014, and the estimated amount of stubbles left in paddy fields was at least 1514 to 1973 kg ha(-1). Comparable measurements of corn plants and stubbles in corn fields showed that the average height of corn stubbles harvested by hand was 9.1 +/- 2.5 cm and the corresponding stubble biomass was only about 7-9% of the total top-part biomass (excluding ears) amounting to 413-639 kg ha(-1). This was the first study that quantitatively elucidated the importance of rice stubbles in C sequestration and soil fertility in paddy fields in recent China.

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