辣椒秸秆腐解物化感作用的研究

Allelopathy of decomposing pepper stalk on pepper growth.

以粉碎腐解的辣椒秸秆为材料研究其对自身的化感作用．按照植株干重：田园土重为1：100、3：100和5：100不同比例进行盆栽试验．结果表明，腐解物中的化感物质导致辣椒植株生长减缓．在60d时测定，植株高度、茎粗、地上和地下部分干重等生物量下降了0．0374～0．0646、0．0020～0．0097、0．0050～0．0355、0．0916～0．3584，光合指标叶面积、叶绿索含量减小了0．0016～0．0251、0．0043～0．0242；在120d时，腐解物中的化感物质抑制程度增加，但与对照比较均未达到显著水平．腐解物中的化感物质对辣椒根系活力、根系保护酶（SOD、POD、CAT）活性的抑制及MDA生成量、相对电导率的促进均随着处理含量加大、处理时间延长，化感作用加强，化感效应范围为0．0163～0．6507，明显高于其对生长指标的化感效应．

With decomposing pepper stalk as test material, this paper studied its allelopathy on the growth of pepper plants. The results showed that after 60 days of decomposition, the decomposed pepper stalk could decrease the plant height, stem diameter, dry weights of above-and underground biomass, leaf area, and chlorophyll content of pepper plants by 0. 0374- 0. 0646, 0. 0020 - 0. 0097, 0. 0050 - 0. 0355 and 0. 0916 - 0. 3584, 0. 0016 - 0. 0251, and 0.0043-0. 0242 respectively. These inhibitory effects were enhanced after 120 days of decomposition, but the difference with CK was not significant. The root vigor and its SOD, POD and CAT activities of pepper plants were decreased, while the MDA content and relative conductivity were increased with the increasing concentration of decomposed pepper stalk and with the prolong of treating time. The allelopathie effects of decomposed pepper stalk on the physiological indices of pepper root activity ranged from 0. 0163 to 0. 6507, which was significantly higher than that of plant growth index.