Zhang Ming, Zhang Ren-Zhi, Cai Li-Qun
College of Resources and Environmental Sciences, Gansu Agricultural University, Lanzhou 730070, China.
Ying Yong Sheng Tai Xue Bao. 2008 Jul;19(7):1467-74.
Based on a long-term experiment, the leaf water potential of spring wheat and field pea, its relationships with environmental factors, and the diurnal variations of leaf relative water content and water saturation deficient under different tillage patterns were studied. The results showed that during whole growth period, field pea had an obviously higher leaf water potential than spring wheat, but the two crops had similar diurnal variation trend of their leaf water potential, i.e., the highest in early morning, followed by a descent, and a gradual ascent after the descent. For spring wheat, the maximum leaf water potential appeared at its jointing and heading stages, followed by at booting and flowering stages, and the minimum appeared at filling stage. For field pea, the maximum leaf water potential achieved at squaring stage, followed by at branching and flowering stages, and the minimum was at podding stage. The leaf relative water content of spring wheat was the highest at heading stage, followed by at jointing and flowering stages, and achieved the minimum at filling stage; while the water saturation deficient was just in adverse. With the growth of field pea, its leaf relative water content decreased, but leaf water saturation deficient increased. The leaf water potential of both spring wheat and field pea had significant correlations with environmental factors, including soil water content, air temperature, solar radiation, relative air humidity, and air water potential. Path analysis showed that the meteorological factor which had the strongest effect on the diurnal variation of spring wheat' s and field pea' s leaf water potential was air water potential and air temperature, respectively. Compared with conventional tillage, the protective tillage patterns no-till, no-till plus straw mulching, and conventional tillage plus straw returning increased the leaf water potential and relative water content of test crops, and the effect of no-till plus straw mulching was most significant.
基于一项长期试验，研究了春小麦和豌豆的叶片水势、其与环境因子的关系以及不同耕作方式下叶片相对含水量和水分饱和亏缺的日变化。结果表明，在整个生育期，豌豆的叶片水势明显高于春小麦，但两种作物叶片水势的日变化趋势相似，即清晨最高，随后下降，下降后又逐渐上升。对于春小麦，叶片水势最大值出现在拔节期和抽穗期，其次是孕穗期和开花期，最小值出现在灌浆期。对于豌豆，叶片水势最大值出现在现蕾期，其次是分枝期和开花期，最小值出现在结荚期。春小麦的叶片相对含水量在抽穗期最高，其次是拔节期和开花期，在灌浆期达到最低；而水分饱和亏缺则相反。随着豌豆的生长，其叶片相对含水量下降，但叶片水分饱和亏缺增加。春小麦和豌豆的叶片水势与土壤含水量、气温、太阳辐射、空气相对湿度和空气水势等环境因子均存在显著相关性。通径分析表明，对春小麦和豌豆叶片水势日变化影响最大的气象因子分别是空气水势和气温。与传统耕作相比，免耕、免耕+秸秆覆盖和传统耕作+秸秆还田等保护性耕作方式提高了供试作物的叶片水势和相对含水量，其中免耕+秸秆覆盖的效果最为显著。
Zotero 插件