紫云英-稻秸联合利用对我国南方稻田土壤团聚体和土壤有机碳稳定性的影响

doi:10.1016/j.jia.2022.09.025

Journal of Integrative Agriculture ›› 2023, Vol. 22 ›› Issue (5): 1529-1545.DOI: 10.1016/j.jia.2022.09.025

紫云英-稻秸联合利用对我国南方稻田土壤团聚体和土壤有机碳稳定性的影响

收稿日期:2022-05-29 接受日期:2022-08-22 出版日期:2023-05-20 发布日期:2022-08-22

The effects of co-utilizing green manure and rice straw on soil aggregates and soil carbon stability in a paddy soil in southern China

ZHANG Zi-han^1*, NIE Jun^2*, LIANG Hai¹, WEI Cui-lan³, WANG Yun¹, LIAO Yu-lin², LU Yan-hong², ZHOU Guo-peng⁴, GAO Song-juan^1#, CAO Wei-dong^4#

¹ College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, P.R.China ² Soil and Fertilizer Institute of Hunan Province, Hunan Academy of Agricultural Sciences, Changsha 410125, P.R.China ³College of Environment and Ecology, Jiangsu Open University, Nanjing 210036, P.R.China ⁴Key Laboratory of Plant Nutrition and Fertilizer, Ministry of Agriculture and Rural Affairs/Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, P.R.China

Received:2022-05-29 Accepted:2022-08-22 Online:2023-05-20 Published:2022-08-22
About author:ZHANG Zi-han, E-mail: 965237643@qq.com; NIE Jun, E-mail: niejun197@163.com; #Correspondence GAO Song-juan, Tel: +86-25-84399707, E-mail: gaosongjuan@njau.edu.cn; CAO Wei-dong, Tel: +86-10-82109622, E-mail: caoweidong@caas.cn * These authors contributed equally to this study
Supported by:
The study was funded by the National Key Research and Development Program of China (2021YFD1700200), the earmarked fund for China Agriculture Reserch System (CARS-22), and the Natural Science Foundation of Jiangsu Province, China (BK20200112).

摘要/Abstract

摘要： 紫云英-稻秸联合利用作为一种高效的耕作模式，在我国南方稻区已有广泛应用，然而其对稻田土壤团聚体和土壤有机碳稳定性的影响尚缺乏研究。本文基于田间定位试验，研究了紫云英、稻秸及其联合利用对土壤团聚体分布和有机碳组分的影响。田间定位试验设6个处理，分别为冬闲稻秸不还田（Crtl）、冬闲稻秸半量还田（1/2RS）、冬闲稻秸全量还田（RS）、冬种紫云英稻秸不还田（GM）、冬种紫云英稻秸半量还田（GM1/2RS）、冬种紫云英稻秸全量还田（GMRS）。结果表明，GMRS相比RS处理，土壤细大团聚体（0.25-2 mm）含量和团聚体平均质量直径（MWD）分别增加18.9%和3.41%，粉粘粒（<0.053 mm）含量降低14.4%。GMRS相比GM和RS，提高了微团聚体（0.053-0.25 mm）和粉粘粒中的SOC含量。GMRS处理相比RS显著增加了各粒径团聚体和全土中的轻组有机碳（fLOC）含量及其在碳组分中的占比，降低了细大团聚体、微团聚体和全土中矿质结合态有机碳（MOC）的含量及其在碳组分中的占比。GMRS相比GM提高了颗粒态有机碳（iPOC）在有机碳组分中的占比。GMRS对细大团聚体中的iPOC有强烈的正影响，说明联合利用能够促进fLOC转移到iPOC。综上，紫云英-稻秸联合利用能够通过提高fLOC含量培育土壤有机碳库，并促进有机碳转化为iPOC以物理保护的形式固存而提高其稳定性。

Abstract: The co-utilization of green manure (GM) and rice straw (RS) in paddy fields has been widely applied as an effective practice in southern China. However, its effects on soil aggregate and soil organic carbon (SOC) stability remain unclear. In the present study, the effect of GM, RS, and co-utilization of GM and RS on particle size distribution of soil aggregates and SOC density fractions were measured in a field experiment. The experiment included six treatments, i.e., winter fallow (WF) without RS return (Ctrl), WF with 50% RS return (1/2RS), WF with 100% RS return (RS), GM without RS return (GM), GM with 50% RS return (GM1/2RS) and GM with 100% RS return (GMRS). The results showed that the proportion of small macro-aggregates (0.25–2 mm) and the mean weight diameter (MWD) of aggregates in the GMRS treatment was greater (by 18.9 and 3.41%, respectively) than in the RS treatment, while the proportion of silt+clay particles (<0.053 mm) was lower (by 14.4%). The concentration of SOC in microaggregates (0.053–0.25 mm) and silt+clay particles was higher in the GMRS treatment than in GM and RS treatments individually. The concentration and proportion of free light organic carbon (fLOC) in aggregates of various particle sizes and bulk soil was greater in the GMRS treatment than the RS treatment, whereas the concentration and proportion of mineral-associated organic carbon in small macroaggregates, microaggregates, and bulk was lower in the GMRS treatment than in the RS treatment. The proportion of intra-aggregate particulate organic carbon (iPOC) was greater in the GMRS treatment than in GM treatment. The GMRS treatment had strong positive effects on iPOC in small macroaggregates, suggesting that SOC was transferred from fLOC to iPOC. In conclusion, co-utilizing green manure and rice straw cultivated the SOC pool by increasing the concentration of fLOC and improved soil carbon stability by promoting the sequestration of organic carbon in iPOC as a form of physical protection.

Key words: soil aggregation , milk vetch , rice straw , SOC density fractions , C stability , paddy soil

ZHANG Zi-han, NIE Jun, LIANG Hai, WEI Cui-lan, WANG Yun, LIAO Yu-lin, LU Yan-hong, ZHOU Guo-peng, GAO Song-juan, CAO Wei-dong. 紫云英-稻秸联合利用对我国南方稻田土壤团聚体和土壤有机碳稳定性的影响[J]. Journal of Integrative Agriculture, 2023, 22(5): 1529-1545.

ZHANG Zi-han, NIE Jun, LIANG Hai, WEI Cui-lan, WANG Yun, LIAO Yu-lin, LU Yan-hong, ZHOU Guo-peng, GAO Song-juan, CAO Wei-dong. The effects of co-utilizing green manure and rice straw on soil aggregates and soil carbon stability in a paddy soil in southern China[J]. Journal of Integrative Agriculture, 2023, 22(5): 1529-1545.

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紫云英-稻秸联合利用对我国南方稻田土壤团聚体和土壤有机碳稳定性的影响

The effects of co-utilizing green manure and rice straw on soil aggregates and soil carbon stability in a paddy soil in southern China

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