不同灌溉上限对芥蓝同化物积累和分配的影响

摘要

Objective] The aim was to explore effects of soil moisture on dry matter accumulation and distribution and growth of kai-lan. [Method] In the context of the same irrigation frequency, the influence of irrigation maximum was researched on growth rate, net assimilation rate, and dry matter distribution of kai-lan. [Result] The results showed that regulation on soil moisture extremely significantly affected accu-mulation of photosynthate. When soil moisture was insufficient, the growth term from seedling to mature extended and growth rate declined sharply. Besides, the growth term was of extremely significant negative correlation with growth rate. Meanwhile, leaf assimilation rate decreased considerably. For example, when soil moisture was 65%, distribution of dry matter in plant organs tended to be rational. [Conclusion] Deficit irrigation would significantly lower growth rate, and improve dry matter distri-bution in organs and economic yield and quality of kai-lan.%[目的]为了明确土壤水分对芥蓝生长及其同化物植株中积累和分配影响，[方法]研究相同灌溉频率下不同灌溉上限对芥蓝植株生长速率、净同化速率及各器官干物质分配的变化规律。[结果]调节土壤水分能够极显著影响芥蓝同化物积累过程；土壤水分亏缺使苗期至商品成熟的生长期大幅延长，生长速率极显著下降，生长期与生长速率呈极显著负相关；同时使叶片净同化速率极显著下降。土壤含水量65%时植株各器官的干物质分配较合理，基叶和基茎的物质较充分撤离，菜薹干物质分配比例显著提高。[结论]用控制灌溉上限进行调亏灌溉能极显著降低芥蓝株植生长速率，改善植株各器官的干物质分配比例，提高经济产量和品质。