湖南省典型红壤区不同土地利用方式农田土壤碳氮磷化学计量比特征

doi:10.3864/j.issn.0578-1752.2026.11.010

Abstract

Abstract:

【Objective】Soil nutrient stoichiometric ratios are key indicators for characterizing nutrient cycling and element balance in farmland ecosystems. Taking typical red soil regions in Hunan Province as the research subject, this study explores the effects of different land use patterns on soil C, N and P stoichiometric characteristics, further reveals the variation rules of soil nutrients in red soil areas, and clarifies the types and degrees of regional soil nutrient limitation. 【Method】This study selected plow layer soils from 15 pairs of adjacent paddy, paddy-upland rotation, and upland across five counties from north to south in Hunan Province, China, to explore the stoichiometric ratios of C, N, and P.【Result】Compared with upland soils, paddy and paddy-upland rotation had higher soil organic carbon (SOC) and total nitrogen (TN) content, and enzyme activity C:N ratio (E_C:N), as well as lower C:N and microbial biomass C:N ratio (MBC:MBN), indicating relatively higher N supply capacity and organic C mineralization potential. Meanwhile, paddy exhibited lower total phosphorus (TP) and available phosphorus (AP) content, enzyme activity C:P ratio (E_C:P) and enzyme activity N:P ratio (E_N:P), but higher C:P, N:P, AN:AP, microbial biomass C:P ratio (MBC:MBP) and microbial biomass N:P ratio (MBN:MBP), suggesting relatively insufficient P supply. However, paddy-upland rotation did not significantly alter soil TP content or E_C:Pand E_N:Pratio. Nevertheless, the relatively low content of AP suggests that paddy-upland rotation could, to a certain extent, promote the accumulation of total soil phosphorus, while the availability of such phosphorus remained low. The analysis of correlation and redundancy showed that soil organic carbon, total nitrogen, and total phosphorus were key influencing factors for the stoichiometric ratios of C, N, and P in cultivated soil, microbial biomass, and extracellular enzymes in red soil regions.【Conclusion】In summary, in typical red soil regions of Hunan Province, paddy and paddy-upland rotation had relatively sufficient N supply, with high potential for organic carbon mineralization (which is easily mineralized). The flooded environment might be the main reason for maintaining their relatively high organic carbon content. The total phosphorus content in paddy-upland rotation fields was relatively high, yet its availability needed to be improved.

Key words: typical red soil regions, land use patterns, soil nutrient stoichiometric ratios, microbial biomass, enzyme activities

LIN Jiao, MOU TingSen, CHEN Jun, LI Xiang, YUAN SiYu, LIU Le, ZHANG ZhenHua, XIA YinHang. The Characteristics of Stoichiometric Ratios of Carbon, Nitrogen and Phosphorus in Farmland Soils Under Different Land Use Patterns in Typical Red Soil Regions of Hunan Province[J].Scientia Agricultura Sinica, 2026, 59(11): 2434-2446.

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类型 Type	季节 Season	施肥量Fertilizer application rate (kg·hm^-2)
类型 Type	季节 Season	N	P₂O₅	K₂O
水田 Paddy	水稻季 Rice season	150-180	60-84	105-129
水旱轮作 Paddy-upland rotation	水稻季 Rice season	150-180	60-84	105-129
水旱轮作 Paddy-upland rotation	油菜季 Rapeseed season	120-150	45-60	75-90
旱地 Upland	玉米季 Corn season	160-240	90-120	70-100
	大豆季 Soybean season	30-60	20-45	40-60
	花生季 Peanut season	50-80	45-60	50-70
	油菜季 Rapeseed season	120-150	45-60	75-90

名称Name		类型Type
β-1,4-葡萄糖苷酶, BG	4-Methylumbelliferyl β-D-glucopyranoside	碳循环相关酶 C-cycling-enzyme
β-1,4-木糖苷酶, BX	4-Methylumbelliferyl β-D-xylopyranoside	碳循环相关酶C-cycling-enzyme
β-1,4-N-乙酰氨基葡萄糖苷酶, NAG	4-Methylumbelliferyl N-acetyl-β-D-glucosaminide	氮循环相关酶 N-cycling-enzyme
亮氨酸氨基肽酶, LAP	L-Leucine-7-amido-4-methylcoumarin hydrochloride	氮循环相关酶N-cycling-enzyme
碱性磷酸酶, ALP	4-Methylumbelliferyl phosphate	磷循环相关酶P-cycling-enzyme

The Characteristics of Stoichiometric Ratios of Carbon, Nitrogen and Phosphorus in Farmland Soils Under Different Land Use Patterns in Typical Red Soil Regions of Hunan Province

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