On the nitrate-N accumulated characteristics in deep soil layer of winter wheat field in Taihang Piedmont Soil respiration rate of farmland ecosystem in Taihang Piedmont System analysis of typical models of eoo-agricultural construction in Taihang Piedmont--A case study from Luancheng County of Hebei Produce The Quantitative Features of A Typical Agroecosystem and the Strategies for its Sustainable Development in the High Production Area in Taihang Piedmont Analysis on structure succession of farmland ecosystems and its function change in Luancheng County


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