中国油料作物学报2012，Vol.34Issue(1)：48-55,8.
水钾耦合对大豆光合特性及其产物积累运转的影响
Effects of water - potassium coupling on photosynthetic characteristics and photoassimilation in soybean
摘要
Abstract
Pot experiment was carried out to study the effect of water - potassium coupling on photosynthetic characteristics and water use efficiency of soybean. In this experiment, five water supply levels and three potassium fertilizer levels were applied at seedling stage, flowering stage and podding stage respectively. The results showed that both soil water and water - potassium coupling had highly significant effects on soybean net photosynthetic rate (Pn) when soil water content was controlled at seedling stage and flowering stage. The soil moisture had positive effect on Pn when soil moisture was regulated at podding stage. The measured Pn after flowering stage or podding stage was superior to that of seedling stage for the same treatment. Photosynthesis rate( Pn) , transpiration rate( Tr) and stomatal conductance ( Gs ) had similar changes at the same stage where soil water content played a more important role than potassium fertilizer. In generally, the same fertilizer condition, the impact of soil moisture level on Pn, Tr and Gs was ranked as W4＞W3, W5＞W2＞ Wl. The potassium fertilizer application ( K2 and K3 ) enhanced Pn, Tr and Gs in soybean only with suitable soil moisture condition (W3). Soil water content had a positive effect on water use efficiency (WUE) and played a more important role than potassium fertilizer when soil moisture was controlled at the same growth stage. When soil moisture was controlled at seedling stage and flowering stage, net photosynthetic rate was highly significantly relevant to root, stem and leaf dry matter weight(p＜0. 01). The correlative degree between net photosynthetic rate and the dry matter weight of each apparatus showed the order of stem > leaf > root. When soil moisture was controlled at podding stage, net photosynthetic rate had highly significantly related to root, stem and leaf dry matter weight(p＜0. 01) and significantly correlated with pod - seed dry matter weight(p＜0.05).关键词
水钾耦合/光合特性/水分利用效率/大豆Key words
Water - potassium coupling/ Photosynthetic characteristics/ Water use efficiency/ Soybean分类
农业科技引用本文复制引用
闫春娟,韩晓增,王文斌,宋书宏..水钾耦合对大豆光合特性及其产物积累运转的影响[J].中国油料作物学报,2012,34(1):48-55,8.基金项目
国家重点基础研究发展计划(2005CB121103 （）
2005CB121106) （）
