生物炭对酸性红壤改良及纽荷尔脐橙苗生长的影响

采用盆栽试验，以0、1%、2% 生物炭量及其配施化肥（F）施于酸性红壤中，研究了生物炭对酸性红壤理化性质以及脐橙幼苗生长的影响。结果表明，不同生物炭用量对酸性红壤理化性质有明显影响。其中，红壤有机碳含量和pH值均有显著改变，如pH值提高0.45-0.96个单位、有机碳含量提高1-3.1倍；生物炭也能够提高红壤中碱解氮、速效磷和速效钾等含量，其中速效钾提高最为显著。生物炭处理脐橙幼苗茎粗增加量比对照多0.10-0.24cm；单施生物炭脐橙幼苗抽梢和叶片总量无明显提高，但生物炭与底肥配施的抽梢和叶片总量分别比对照高21.0%和70.0%。施生物炭后新叶中氮则随生物炭量增加而降低。除对照老叶外，磷含量在老叶和新叶中均随生物炭量增大而提高；同时，不同炭处理老叶和新叶中钾含量表现为：1%C>2%C>CK，F>F+2%C>F+1%C。因此，生物炭能改良酸性红壤，也有利于脐橙苗的生长。

Effects of biochar amendment on red soil and growth of seedlings of navel Orange

To investigate the effects of biochar on chemical properties of red soil and agronomic traits of seedlings of navel Orange, Three biochar application rates (0, 1%, 2%) were applied in a pot experiment. Application of biochar could promote the navel orange stem thickening, the total number of both sprouting growth and leaves are not significantly higher than control, and greater application rates of biochar made results more obvious. After the addition of biochar, the total N content of old leaves was depressed, this is opposite to the young leaves. In addition to CK, the total P content was becoming higher when biochar addition increased; The total K content in the old leaves and young leaves were in the similarly distribution trend when different biochar application rates were add, the results was 1%C>2%C>CK and F>F 2%C>F 1%C. The addition of biochar also had an impact on chemical properties of soil. On the one hand, biochar addition could increase the organic carbon content and the values of pH for soil, and on the other, biochar addition had significant effect on the alkaline N content compared to CK. Also, it obviously increased the available P content of the soil as well as the available K content. The mineral elements contents were positively interrelated to the biochar application rates. So, biochar was beneficial to seedlings of navel Orange growth and could amend the organic carbon content, values of pH and the available mineral element content.