Taking Hainan Eucalyptus plantation as the research object with 4 other kinds of plantations or natural forest as reference plots, the effects of different forest land types on soil nutrient contents were analyzed, an...Taking Hainan Eucalyptus plantation as the research object with 4 other kinds of plantations or natural forest as reference plots, the effects of different forest land types on soil nutrient contents were analyzed, and the differences of soil properties were discussed. The results showed that: (1) Eucalyptus plantations were relatively helpful to reduce soil bulk density and enhance the stability of water-stable aggregates;(2) Eucalyptus plantations can improve the content of soil organic matter;(3) Soil pH showed an overall acidi fication trend under forest land conditions in Hainan;total nitrogen and alkali-hydrolyzed nitrogen content of Eucalyptus plantations showed a downward trend with the deepening of soil layer;total phosphorus and available phosphorus content showed a downward trend, while organic matter, total potassium and available K showed an upward trend. (4) The contents of total phosphorus and available phosphorus in the soil of Eucalyptus plantations of different ages did not change significantly, whereas the contents of other nutrients decreased gradually with the increase of soil depth.展开更多
在洞庭湖区农田施用秸秆生物炭不仅能实现秸秆资源化利用,还可降低环境污染压力。本研究于2020年采用水稻盆栽试验,研究了不同南荻秸秆生物炭施用量对土壤氨挥发速率、累积氨挥发量、表面水pH值和NH_(4)^(+)-N浓度的影响。供试土壤为第...在洞庭湖区农田施用秸秆生物炭不仅能实现秸秆资源化利用,还可降低环境污染压力。本研究于2020年采用水稻盆栽试验,研究了不同南荻秸秆生物炭施用量对土壤氨挥发速率、累积氨挥发量、表面水pH值和NH_(4)^(+)-N浓度的影响。供试土壤为第四纪红土发育的红黄泥和花岗岩发育的麻砂泥水稻土,设置6个南荻秸秆生物炭添加处理,即分别以土柱0~20 cm土壤重量的0%、1%、2%、4%、6%和8%比例添加生物炭,每盆施用复合肥200 kg N·hm^(-2)。结果表明:施用生物炭导致两种土壤之间或不同生物炭处理之间的氨挥发速率和累积量均存在显著差异。麻砂泥施用生物炭处理在施肥后第2天出现氨挥发峰值,且较不施生物炭处理峰值降低了23.6%~53.4%;红黄泥氨挥发峰值出现在施肥后第7~13天,且其峰值随着生物炭添加量的增加而升高。整体上,麻砂泥土壤的氨挥发速率均高于红黄泥。麻砂泥土壤<4%生物炭添加量能抑制土壤氨挥发速率及累积量,其中以2%处理降幅最大(46.9%),但生物炭添加对水稻生长前期表面水pH值的影响不显著;红黄泥土壤随着南荻生物炭用量的增加,表面水中pH值和NH_(4)^(+)-N浓度增加,导致氨挥发速率及累积量增幅达1.3~10.5倍。回归分析显示,生物炭添加量是影响两种土壤氨挥发的关键因素。Elo-vich方程能较好地拟合两种土壤的氨挥发累积量随时间的变化动态,各施炭处理的相关系数均达极显著水平。总体上,对于偏中性的麻砂泥土壤,施用一定量的南荻生物炭对氨排放有一定的抑制作用,而对于酸性的红黄泥土壤,增施南荻生物炭会通过提高表面水的pH值和NH_(4)^(+)-N浓度促进氨挥发,因此针对不同类型土壤施用南荻秸秆生物炭应注意选择适宜用量,以降低氮素损失。展开更多
文摘Taking Hainan Eucalyptus plantation as the research object with 4 other kinds of plantations or natural forest as reference plots, the effects of different forest land types on soil nutrient contents were analyzed, and the differences of soil properties were discussed. The results showed that: (1) Eucalyptus plantations were relatively helpful to reduce soil bulk density and enhance the stability of water-stable aggregates;(2) Eucalyptus plantations can improve the content of soil organic matter;(3) Soil pH showed an overall acidi fication trend under forest land conditions in Hainan;total nitrogen and alkali-hydrolyzed nitrogen content of Eucalyptus plantations showed a downward trend with the deepening of soil layer;total phosphorus and available phosphorus content showed a downward trend, while organic matter, total potassium and available K showed an upward trend. (4) The contents of total phosphorus and available phosphorus in the soil of Eucalyptus plantations of different ages did not change significantly, whereas the contents of other nutrients decreased gradually with the increase of soil depth.
文摘在洞庭湖区农田施用秸秆生物炭不仅能实现秸秆资源化利用,还可降低环境污染压力。本研究于2020年采用水稻盆栽试验,研究了不同南荻秸秆生物炭施用量对土壤氨挥发速率、累积氨挥发量、表面水pH值和NH_(4)^(+)-N浓度的影响。供试土壤为第四纪红土发育的红黄泥和花岗岩发育的麻砂泥水稻土,设置6个南荻秸秆生物炭添加处理,即分别以土柱0~20 cm土壤重量的0%、1%、2%、4%、6%和8%比例添加生物炭,每盆施用复合肥200 kg N·hm^(-2)。结果表明:施用生物炭导致两种土壤之间或不同生物炭处理之间的氨挥发速率和累积量均存在显著差异。麻砂泥施用生物炭处理在施肥后第2天出现氨挥发峰值,且较不施生物炭处理峰值降低了23.6%~53.4%;红黄泥氨挥发峰值出现在施肥后第7~13天,且其峰值随着生物炭添加量的增加而升高。整体上,麻砂泥土壤的氨挥发速率均高于红黄泥。麻砂泥土壤<4%生物炭添加量能抑制土壤氨挥发速率及累积量,其中以2%处理降幅最大(46.9%),但生物炭添加对水稻生长前期表面水pH值的影响不显著;红黄泥土壤随着南荻生物炭用量的增加,表面水中pH值和NH_(4)^(+)-N浓度增加,导致氨挥发速率及累积量增幅达1.3~10.5倍。回归分析显示,生物炭添加量是影响两种土壤氨挥发的关键因素。Elo-vich方程能较好地拟合两种土壤的氨挥发累积量随时间的变化动态,各施炭处理的相关系数均达极显著水平。总体上,对于偏中性的麻砂泥土壤,施用一定量的南荻生物炭对氨排放有一定的抑制作用,而对于酸性的红黄泥土壤,增施南荻生物炭会通过提高表面水的pH值和NH_(4)^(+)-N浓度促进氨挥发,因此针对不同类型土壤施用南荻秸秆生物炭应注意选择适宜用量,以降低氮素损失。
