In order to improve the quality of cultivated land in Liaoning Province in the light of local conditions, medium- and low-yielding farmland in Liaoning Province are divided into various zones according to characterist...In order to improve the quality of cultivated land in Liaoning Province in the light of local conditions, medium- and low-yielding farmland in Liaoning Province are divided into various zones according to characteristics of the terrain, and the practical and feasible improvement measures are put forward based on the current situation and main existing problems in the medium- and low-yielding farmland in different areas,展开更多
The building of Shuikou Hydropower Station in the Minjiang River is the largest one in the region of east China. Its install capacity is 1.4 million kw., and its generated energy of planning is 4.95 billion kwh each y...The building of Shuikou Hydropower Station in the Minjiang River is the largest one in the region of east China. Its install capacity is 1.4 million kw., and its generated energy of planning is 4.95 billion kwh each year. In accordance with a comprehensive survey of the valley of the middle-lower reaches of the Minjiang River and the characteristic of hydrography and in association with the specific type of the hydrography station, we can be sure that no harm will be done to the ecological environment when a hydropower station is built at Shuikou. Not only the deposition of silt within the reservoir must not be very serious, it is also more favorable than before for the irrigation of farmland on plains in the lower reaches of the Minjiang River and inland navigation.In addition, after the completion of the power station, the ecological environment will be the same as before both at the Minjiang River estuary and beyond it.展开更多
农田生态系统碳足迹分析有利于找出问题,为低碳农业提供支撑。本文基于碳足迹全循环指标系统,以山东省泰安、滕州、龙口三地的中高产田为例,研究了耕作方式对中高产田耗碳足迹、固碳足迹、净耗碳(△GHG)、单位产值碳足迹(CFv)及单位产...农田生态系统碳足迹分析有利于找出问题,为低碳农业提供支撑。本文基于碳足迹全循环指标系统,以山东省泰安、滕州、龙口三地的中高产田为例,研究了耕作方式对中高产田耗碳足迹、固碳足迹、净耗碳(△GHG)、单位产值碳足迹(CFv)及单位产量碳足迹(CFy)的影响。结果表明:农田生态系统耗碳足迹中,化合物耗碳中N肥和土壤N_2O耗碳占了79.69%~92.53%,其中仅N肥就占了53.82%~62.49%;机电油耗碳的80%以上是灌溉、耕作、播种和收获产生的;有机耗碳中98.83%以上是秸秆耗碳。农田生态系统中主要是籽粒与秸秆固碳,籽粒固碳占总固碳的39.05%~52.64%;滕州的总固碳比其他两个城市高出196.3~7 801.5 kg CO_2/hm^2(旋耕除外);三地农田生态系统的ΔGHG值在-3 524.7^-8 774.3 kg CO_2/hm^2,均表现为碳汇;夏玉米季的净固碳高于冬小麦季;翻耕的净固碳量明显高于旋耕和耙耕。在冬小麦-夏玉米一年两熟条件下,夏玉米的CFv和CFy均显著高于冬小麦;CFv和CFy均表现为冬小麦翻耕-夏玉米免耕>冬小麦旋耕-夏玉米免耕>冬小麦耙耕-夏玉米免耕;地区间的CFv和CFy规律性不明显。因此,提高农业机械作业效率、减少机电油耗,提高氮肥和水分利用效率,建立合适的土壤耕作制度,提高作物产量,是山东省提高净固碳能力的重要突破方向。同时,继续挖掘夏玉米的固碳潜力、提高冬小麦的固碳能力,是作物育种与栽培应该重点解决的问题。展开更多
文摘In order to improve the quality of cultivated land in Liaoning Province in the light of local conditions, medium- and low-yielding farmland in Liaoning Province are divided into various zones according to characteristics of the terrain, and the practical and feasible improvement measures are put forward based on the current situation and main existing problems in the medium- and low-yielding farmland in different areas,
文摘The building of Shuikou Hydropower Station in the Minjiang River is the largest one in the region of east China. Its install capacity is 1.4 million kw., and its generated energy of planning is 4.95 billion kwh each year. In accordance with a comprehensive survey of the valley of the middle-lower reaches of the Minjiang River and the characteristic of hydrography and in association with the specific type of the hydrography station, we can be sure that no harm will be done to the ecological environment when a hydropower station is built at Shuikou. Not only the deposition of silt within the reservoir must not be very serious, it is also more favorable than before for the irrigation of farmland on plains in the lower reaches of the Minjiang River and inland navigation.In addition, after the completion of the power station, the ecological environment will be the same as before both at the Minjiang River estuary and beyond it.
文摘农田生态系统碳足迹分析有利于找出问题,为低碳农业提供支撑。本文基于碳足迹全循环指标系统,以山东省泰安、滕州、龙口三地的中高产田为例,研究了耕作方式对中高产田耗碳足迹、固碳足迹、净耗碳(△GHG)、单位产值碳足迹(CFv)及单位产量碳足迹(CFy)的影响。结果表明:农田生态系统耗碳足迹中,化合物耗碳中N肥和土壤N_2O耗碳占了79.69%~92.53%,其中仅N肥就占了53.82%~62.49%;机电油耗碳的80%以上是灌溉、耕作、播种和收获产生的;有机耗碳中98.83%以上是秸秆耗碳。农田生态系统中主要是籽粒与秸秆固碳,籽粒固碳占总固碳的39.05%~52.64%;滕州的总固碳比其他两个城市高出196.3~7 801.5 kg CO_2/hm^2(旋耕除外);三地农田生态系统的ΔGHG值在-3 524.7^-8 774.3 kg CO_2/hm^2,均表现为碳汇;夏玉米季的净固碳高于冬小麦季;翻耕的净固碳量明显高于旋耕和耙耕。在冬小麦-夏玉米一年两熟条件下,夏玉米的CFv和CFy均显著高于冬小麦;CFv和CFy均表现为冬小麦翻耕-夏玉米免耕>冬小麦旋耕-夏玉米免耕>冬小麦耙耕-夏玉米免耕;地区间的CFv和CFy规律性不明显。因此,提高农业机械作业效率、减少机电油耗,提高氮肥和水分利用效率,建立合适的土壤耕作制度,提高作物产量,是山东省提高净固碳能力的重要突破方向。同时,继续挖掘夏玉米的固碳潜力、提高冬小麦的固碳能力,是作物育种与栽培应该重点解决的问题。
