Effects of Engineering Reclamation Measures on Soil Quality Evolution Characteristics of Mining Subsidence Area in Southeastern Shanxi

doi:10.11924/j.issn.1000-6850.casb20200100009

Abstract

Abstract:

To reveal the evolution characteristics of soil quality of coal mining subsidence area under different engineering reclamation measures, based on a 10 years long-term test, the authors studied the soil physical and chemical properties, microbial community structure and the change characteristics of land productivity in coal mining subsidence area in the southeast Shanxi, with topsoil stripping and mixed pushing engineering reclamation. The results showed that in the beginning of the reclamation, the physical and chemical properties of reclaimed soil and land productivity under topsoil stripping reclamation were significantly higher than that of mixed pushing reclamation. After 7 years of reclamation, the physical properties, microbial community structure composition and diversity and land productivity of the soil were basically the same between the two measures, and the difference was not significant. During the 10 years of reclamation, the soil nutrient content in 0-20 cm soil layer was always shown as topsoil stripping > mixed reclamation. During the 10 years, the cumulative return of topsoil stripping increased by 6609 yuan/hm² compared with that of mixed pushing reclamation. Topsoil stripping reclamation was better than mixed pushing reclamation in maintaining topsoil fertility and comprehensive return. However, after 10 years of reclamation, the land productivity and fertility level of the two reclamation measures were very low, indicating that the reclamation method was only a leading link in the mining area reclamation process, and the ecological restoration of the soil in the mining area must be combined with fertilization measures.

Key words: topsoil stripping, mixed pushing, soil quality, soil microbial community, reclaimed farmland, coal mining subsidence area

CLC Number:

S156.99

Li Jianhua, Li Hua, Gao Chunhua, Jin Dongsheng, Lu Jinjing. Effects of Engineering Reclamation Measures on Soil Quality Evolution Characteristics of Mining Subsidence Area in Southeastern Shanxi[J]. Chinese Agricultural Science Bulletin, 2020, 36(17): 62-70.

Figures/Tables 10

References 37

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处理	ACE指数	Chao1指数	Simpson指数	Shannon指数	覆盖率
TS	675.377±92 a	683.0645±77 a	0.0063±0.0003 a	4.3296±0.018a	0.9966±0.002 a
MP	664.932±83 a	671.4891±75 a	0.0065±0.0005 a	4.2781±0.021 a	0.9961±0.004 a

处理	ACE指数	Chao1指数	Simpson指数	Shannon指数	覆盖率
TS	675.377±92 a	683.0645±77 a	0.0063±0.0003 a	4.3296±0.018a	0.9966±0.002 a
MP	664.932±83 a	671.4891±75 a	0.0065±0.0005 a	4.2781±0.021 a	0.9961±0.004 a

处理	生物量		产量
处理	TS	MP	TS	MP
1~3年	5438±881 Aa	2773±194 Bc	3915±453 Aa	2231±291 Bc
4~7年	4146±213 Ab	3621±209 Bb	3504±603 Ab	3193±124 Bb
8~10年	4318±279 Ab	3946±211 Aa	3529±573 Ab	3609±651 Aa

处理	生物量		产量
处理	TS	MP	TS	MP
1~3年	5438±881 Aa	2773±194 Bc	3915±453 Aa	2231±291 Bc
4~7年	4146±213 Ab	3621±209 Bb	3504±603 Ab	3193±124 Bb
8~10年	4318±279 Ab	3946±211 Aa	3529±573 Ab	3609±651 Aa

处理	复垦投资/(元/hm²)	10年玉米累计产量/(kg/hm²)	玉米产值/(元/hm²)	综合效益增加/(元/hm²)
TS	8100 ±150	36348 ±1674	54522 ±2511	6609±134
MP	5625 ±125	30292 ±1522	45438 ±2283	—