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Lacey Act provisions on plant and plant products has brought Chinese forest enterprises up against unprecedented difficulties and challenges.

中国是美国林产品市场最大的生产国与供应国之一,美国雷斯法案修正案植物条款的实施,使中国林产品企业面临前所未有的困难和挑战。

Under contour cropping +balanced fertilization,adding treatment with contour hedgerow strip reduced 3.

结果表明,在等高种植+平衡施肥+等高植物篱条带组合农艺措施条件下,玉米吸收氮素达到流失总量的99。

Nitrogen(N)balance status between input and removal by corn and straw harvest, water and soil erosion were investigated in this experiment consisted of different cropping patterns, fertilization and contour hedgerow strip.

05%的径流小区实地观测,研究种植方式、施肥方式和等高植物篱条带3种农艺措施不同组合对云南红壤坡耕地氮素投入、带走平衡的影响。