Split N and P addition decreases straw mineralization and the priming effect of a paddy soil: a 100-day incubation experiment

被引：60

作者：

Wang, Dongdong ^{[1
,2
,3
]}

Zhu, Zhenke ^{[1
,2
]}

Shahbaz, Muhammad ^{[4
,5
]}

Chen, Liang ^{[6
]}

Liu, Shoulong ^{[1
,2
]}

Inubushi, Kazuyuki ^{[7
]}

Wu, Jinshui ^{[1
,2
,3
]}

Ge, Tida ^{[1
,2
]}

机构：

[1] Chinese Acad Sci, Inst Subtrop Agr, Key Lab Agroecol Proc Subtrop Reg, Changsha 410125, Hunan, Peoples R China

[2] Chinese Acad Sci, Inst Subtrop Agr, Changsha Res Stn Agr & Environm Monitoring, Changsha 410125, Hunan, Peoples R China

[3] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

[4] Swedish Univ Agr Sci, Dept Soil & Environm, Box 7014, S-75007 Uppsala, Sweden

[5] Lund Univ, Ctr Environm & Climate Res, S-22362 Lund, Sweden

[6] Cent South Univ Forestry & Technol, Fac Life Sci & Technol, Changsha 410004, Hunan, Peoples R China

[7] Chiba Univ, Grad Sch Hort, Matsudo, Chiba 2718510, Japan

来源：

BIOLOGY AND FERTILITY OF SOILS | 2019年 / 55卷 / 07期

基金：

美国国家科学基金会;

关键词：

Straw return; Mineral fertilizer application; SOM mineralization; Microbial C use efficiency; CO2 equivalent emission; Paddy soil ecosystem; CARBON-USE EFFICIENCY; ORGANIC-MATTER; RICE-STRAW; ENZYME-ACTIVITIES; METHANE EMISSION; FLOODED RICE; STOICHIOMETRY; FERTILIZATION; NITROGEN; FATE;

D O I：

10.1007/s00374-019-01383-6

中图分类号：

S15 [土壤学];

学科分类号：

0903 ; 090301 ;

摘要：

The effect of mineral fertilization and its application pattern on microbial activity and the subsequent CO2 and CH4 emissions arising from soil organic matter (SOM) or added substrate remains unclear. We quantified the decomposition of C-13-labeled straw and the priming effect (PE) governed by the N and P fertilizer application pattern during a 100-day experiment in a flooded soil. Straw addition increased the total CO2 and CH4 emissions. Straw mineralization increased by 30% and decreased by 19% after full and split NP application, respectively, compared with only straw addition. However, application of NP fertilization (full or split) inhibited straw-derived CH4 emissions compared with only straw addition. SOM decomposition was increased by straw addition, yielding a positive PE for CO2 emission. The application of split NP fertilization along with straw addition improved microbial activity, yielding the highest positive PE for CO2 emission. In contrast, compared with the control (no addition), split NP application decreased the positive PE for CH4 emission. Therefore, the straw-C-derived total CO2 equivalent emission was decreased by split NP application. These results were mainly attributable to the increased Olsen P, microbial biomass, enzyme activity, and straw-derived C microbial use efficiency of split NP application, which negatively affected the PE for CH4 emission; this was supported by the results of standardized total effects determined from structural equation models. Overall, compared with full application, split NP fertilizer application significantly decreased the straw-C mineralization rate and PE for CH4 emission, thereby mitigating greenhouse gas emission and SOM storage in paddy soil.

引用

页码：701 / 712

页数：12

共 64 条

[1]

[Anonymous], 2010, HYBRID RICE, DOI DOI 10.16267/J.CNKI.1005-3956.2010.S1.066

[2] The description of sorption curves [J].