The agro-pastoral ecotone has been recognized as the main distribution area of reserved land resource for cultivation. Accordingly, clarifying this assumption, as well as concerting land reclamation and ecological res...The agro-pastoral ecotone has been recognized as the main distribution area of reserved land resource for cultivation. Accordingly, clarifying this assumption, as well as concerting land reclamation and ecological restoration, is important to ensure food security and environmental improvement in the agro-pastoral ecotone. We selected Horqin Left Back Banner(HLBB) as the subject of our case study. The landscape ecological security pattern of this area was determined using the minimum cumulative resistance model. Over-cultivation, quantity of reserved land resource for cultivation, and changes in landscape indexes before and after land use adjustment were then analyzed. Over-cultivation is a serious problem in the agro-pastoral ecotone. Reserved land resource for cultivation is less than that considered previously, and the area of reserved land resource for cultivation in HLBB only accounts for 11.50% of total uncultivated land. With regard to changes in landscape indexes, the adjusted land use pattern is effective for anti-desertification. The compensation standard for abandoned cultivated land should be improved and the comprehensive results of ‘Grain for Green' should be evaluated to further implement ecological restoration in the agro-pastoral ecotone.展开更多
Crop establishment largely depends on the methods of tillage for seedbed preparation. Seedbed conditions and related problems have recently attracted considerable interest for research. The intensity of the soil compa...Crop establishment largely depends on the methods of tillage for seedbed preparation. Seedbed conditions and related problems have recently attracted considerable interest for research. The intensity of the soil compaction achieved because of tillage is related to the working speed of the implement used. The effect of working speed on indices used for the evaluation of seedbed preparation （index of soil texture, actual tillage depth, soil bulk density and the proposed index of leveling） were investigated by applying four different systems of tillage and using different tillage implements. The relationships of the indices investigated to working speed are also presented graphically for all tillage implements used. All relationships were found to be linear with the working speed and the corresponding coefficients of determination were very close to unity. Useful conclusions, which may be used by extension services for the selection of the proper working speed of the implements used for seedbed preparation, are reached. Finally the general conclusion is that reciprocating harrows may be introduced into energetic tillage systems for seedbed preparation.展开更多
基金Foundation item:Under the auspices of the Special Scientific Research of the Ministry of Land and Resources of China(No.201411009)
文摘The agro-pastoral ecotone has been recognized as the main distribution area of reserved land resource for cultivation. Accordingly, clarifying this assumption, as well as concerting land reclamation and ecological restoration, is important to ensure food security and environmental improvement in the agro-pastoral ecotone. We selected Horqin Left Back Banner(HLBB) as the subject of our case study. The landscape ecological security pattern of this area was determined using the minimum cumulative resistance model. Over-cultivation, quantity of reserved land resource for cultivation, and changes in landscape indexes before and after land use adjustment were then analyzed. Over-cultivation is a serious problem in the agro-pastoral ecotone. Reserved land resource for cultivation is less than that considered previously, and the area of reserved land resource for cultivation in HLBB only accounts for 11.50% of total uncultivated land. With regard to changes in landscape indexes, the adjusted land use pattern is effective for anti-desertification. The compensation standard for abandoned cultivated land should be improved and the comprehensive results of ‘Grain for Green' should be evaluated to further implement ecological restoration in the agro-pastoral ecotone.
文摘Crop establishment largely depends on the methods of tillage for seedbed preparation. Seedbed conditions and related problems have recently attracted considerable interest for research. The intensity of the soil compaction achieved because of tillage is related to the working speed of the implement used. The effect of working speed on indices used for the evaluation of seedbed preparation （index of soil texture, actual tillage depth, soil bulk density and the proposed index of leveling） were investigated by applying four different systems of tillage and using different tillage implements. The relationships of the indices investigated to working speed are also presented graphically for all tillage implements used. All relationships were found to be linear with the working speed and the corresponding coefficients of determination were very close to unity. Useful conclusions, which may be used by extension services for the selection of the proper working speed of the implements used for seedbed preparation, are reached. Finally the general conclusion is that reciprocating harrows may be introduced into energetic tillage systems for seedbed preparation.
