Relationship Between Typical Physical Properties of Reclaimed Soil and Biomass in Grassland Opencast Mine Area

doi:10.11924/j.issn.1000-6850.casb20191100791

Abstract

Abstract:

Taking the No.1 opencast coal mine in Shengli, Inner Mongolia as an example, the reclamation land on the south and north mine dumps as the research objects and the undamaged land as the control, variance analysis and Pearson correlation analysis were conducted to study the relationship between typical physical properties of reclaimed soil (soil bulk density and soil moisture content) and above-ground biomass of vegetation, aiming to provide practical support for soil and vegetation reconstruction in grassland mining area. The results indicated that: (1) the correlation intensity of soil bulk density and moisture content in reclaimed land was slightly lower than that of undamaged land, and the negative correlation was more significant by the longer reclamation time; (2) the mean value of vegetation biomass in reclaimed land was higher than that of undamaged land, and the soil environmental factors after reclamation promoted the reconstruction of the ecosystem of dump; (3) at 0-10 cm soil layer, the soil bulk density was negatively correlated with the moisture content, and had very weak or was irrelevant with biomass, but the vegetation biomass had a significantly positive correlation with the moisture content, which indicated that the surface soil moisture content was an important factor affecting vegetation biomass.

Key words: land reclamation, soil reconstruction, soil bulk density, soil moisture content, biomass, dump

CLC Number:

S153.6

Wang Dangchao, Shang Zhi, She Changchao. Relationship Between Typical Physical Properties of Reclaimed Soil and Biomass in Grassland Opencast Mine Area[J]. Chinese Agricultural Science Bulletin, 2020, 36(23): 60-65.

Figures/Tables 12

References 29

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编号	剖面名称	土层深度/cm	砾石分级	土壤质地	复垦年限/a	主要栽种植被
1	未损毁剖面-1	20	中砾	砂质黏壤土	—	克氏针茅、大针茅、糙隐子草、冷蒿、羊草、洽草、冰草、锦鸡儿等
2	未损毁剖面-2	20	中砾	砂质壤土	—
3	未损毁剖面-3	25	少砾	砂质壤土	—
4	南排剖面-1	40	多砾	砂质壤土	4	沙打旺、苜蓿、披碱草、樟子松、柠条等
5	南排剖面-2	30	多砾	砂质黏壤土
6	南排剖面-3	50	多砾	砂质黏壤土
7	北排剖面-1	30	多砾	砂质黏壤土	8	沙打旺、苜蓿、披碱草、柠条等
8	北排剖面-2	15	中砾	粘土
9	北排剖面-3	20	中砾	砂质黏壤土

编号	剖面名称	土层深度/cm	砾石分级	土壤质地	复垦年限/a	主要栽种植被
1	未损毁剖面-1	20	中砾	砂质黏壤土	—	克氏针茅、大针茅、糙隐子草、冷蒿、羊草、洽草、冰草、锦鸡儿等
2	未损毁剖面-2	20	中砾	砂质壤土	—
3	未损毁剖面-3	25	少砾	砂质壤土	—
4	南排剖面-1	40	多砾	砂质壤土	4	沙打旺、苜蓿、披碱草、樟子松、柠条等
5	南排剖面-2	30	多砾	砂质黏壤土
6	南排剖面-3	50	多砾	砂质黏壤土
7	北排剖面-1	30	多砾	砂质黏壤土	8	沙打旺、苜蓿、披碱草、柠条等
8	北排剖面-2	15	中砾	粘土
9	北排剖面-3	20	中砾	砂质黏壤土

样本	容重^*/(g/cm³)	含水率/%
未损毁地	1.35±0.08 a	6.51±3.15
南排土场	1.45±0.09 b	9.24±4.97
北排土场	1.41±0.14 ab	9.91±6.33

样本	容重^*/(g/cm³)	含水率/%
未损毁地	1.35±0.08 a	6.51±3.15
南排土场	1.45±0.09 b	9.24±4.97
北排土场	1.41±0.14 ab	9.91±6.33

样地	相关性系数	显著性	N
未损毁地	-0.70^*	0.01	12
南排土场复垦地	-0.31	0.33	12
北排土场复垦地	-0.42	0.17	12
复垦地	-0.39	0.06	24
未损毁地和复垦地	-0.29	0.08	36