Effects of long-term application of biogas slurry on soil carbon, nitrogen, phosphorus and their metering ratio in poplar plantations

doi:10.12302/j.issn.1000-2006.202212029

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2024, Vol. 48 ›› Issue (6): 102-110.doi: 10.12302/j.issn.1000-2006.202212029

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Effects of long-term application of biogas slurry on soil carbon, nitrogen, phosphorus and their metering ratio in poplar plantations

ZHANG Miao¹(), RUAN Honghua¹^,^*(), SHEN Caiqin², DING Xuenong², CAO Guohua²

1. College of Ecology and Environment,Co-Innovation Center for Sustainable Forestry in Southern China,Nanjing Forestry University,Nanjing 210037,China
2. Dongtai State Forest Farm,Dongtai 224237,China

Received:2022-12-05 Revised:2023-03-23 Online:2024-11-30 Published:2024-12-10
Contact: RUAN Honghua E-mail:1097380894@qq.com;hhruan@njfu.edu.cn

Abstract

Abstract:

【Objective】The effects of biogas slurry on soil carbon (C), nitrogen (N), and phosphorus (P) contents were studied in poplar plantations in coastal areas of northern Jiangsu, China. This research aims to provide a theoretical basis for the scientific utilization of biogas slurry, the optimization of fertilization technology, and the promotion of sustainable development in poplar plantations.【Method】The experiment employed a randomized block design with four levels of biogas slurry application: CK (0 m³/hm²), L (125 m³/hm²), M (250 m³/hm²) and H (375 m³/hm²). Soil samples were collected from different depths: 0-20 cm (surface layer), ≥20-40 cm (middle layer), and ≥40-60 cm(deep layer) using a continuous soil coring method. The study examined the effects of various biogas slurry concentrations on soil C, N and P contents across different soil layers and growing seasons in the poplar plantations.【Result】Biogas slurry application significantly increased the soil organic carbon (SOC), dissolved organic carbon (DOC), microbial biomass carbon (MBC), microbial biomass nitrogen (MBN), total phosphorus (TP), and available phosphorus (AP) in the topsoil (0-20 cm). It also significantly decreased the C/N ratio (mass fraction ratio, the same below) and MBC/MBN ratio in the topsoil. Additionally, biogas slurry significantly increased DOC and TP in the ≥20-40 cm soil layer. However, in the deep soil (≥40-60 cm), biogas slurry had no significant effect on soil C, N, and P levels. Biogas slurry application also significantly reduced soil pH across all layers.【Conclusion】Our research indicates that biogas slurry, as a high-quality, quick-acting organic fertilizer, significantly increases nutrients such as C, N, and P in surface soil but does not affect deep soil. It also reduces soil pH and C/N ratio in coastal saline-alkali soil, improving soil fertility. However, further research is needed to determine whether excessive application could risk phosphorus and nitrogen leaching and potential ecological pollution.

Key words: poplar plantation, biogas slurry, soil carbon, nitrogen and phosphorus, soil microbial biomass, soil C to N mass ratio, soil MBC to MBN ratio

CLC Number:

S714.2

ZHANG Miao, RUAN Honghua, SHEN Caiqin, DING Xuenong, CAO Guohua. Effects of long-term application of biogas slurry on soil carbon, nitrogen, phosphorus and their metering ratio in poplar plantations[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY, 2024, 48(6): 102-110.

Figures/Tables 7

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Table 1

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指标 index	pH	含水率 moisture content	DOC	SOC	MBC	TN	MBN	TP	AP	C/N
含水率moisture content	-0.347^**
DOC	-0.404^**	0.574^**
SOC	-0.466^**	0.583^**	0.871^**
MBC	-0.313^**	0.514^**	0.805^**	0.826^**
TN	-0.322^**	0.559^**	0.915^**	0.774^**	0.714^**
MBN	-0.422^**	0.577^**	0.906^**	0.888^**	0.854^**	0.824^**
TP	-0.460^**	0.441^**	0.595^**	0.675^**	0.644^**	0.504^**	0.687^**
AP	-0.481^**	0.220^*	0.302^**	0.390^**	0.316^**	0.228^*	0.359^**	0.402^**
C/N	0.246^*	-0.320^**	-0.641^**	-0.448^**	-0.407^**	-0.780^**	-0.511^**	-0.171	-0.107
MBC/MBN	0.126	-0.373^**	-0.363^**	-0.283^**	-0.105	-0.353^**	-0.425^**	-0.221^*	-0.09	0.305^**

Effects of long-term application of biogas slurry on soil carbon, nitrogen, phosphorus and their metering ratio in poplar plantations

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