模拟放牧强度下割草地鸭茅可溶性糖含量的季节性变化

Seasonal changes of soluble sugar contents of Dactylis glomerata in mowing pasture under different intensities of simulating grazing

通过在新疆昭苏马场设置不同模拟放牧强度,研究了不同放牧强度下割草地鸭茅Dactylis glomerata叶片和根部可溶性糖含量的季节变化,结果显示:鸭茅叶片可溶性糖在打草前呈上升趋势,返青后叶片可溶性糖含量较高,进入抽穗期后其含量降低。生长季前期根的可溶性糖含量差异不大(P>0.05),打草后其含量迅速变低,而后逐渐上升,9月下旬其含量减少。时间和放牧强度共同作用对鸭茅叶片和根部可溶性糖含量影响显著(P<0.01)。结果表明不同放牧强度对鸭茅叶片和根部可溶性糖含量有一定的影响,由于时间和气候变化的原因,其变化没有呈现一定的规律。

The different simulatant grazing intensity were designed on Zhaosu Horse Farm to study the change of soluble sugar contents in roots and leaves of Dactylis glornerata in mowing pasture. The re- sults showed that the soluble sugar content in leaf was increasing before the cutting. It was high after returning green but low after heading stage. The roots of soluble sugar contents on growth prophase was not significant （P〉0.05）. It was rapidly decreased after cutting, and then raising up until late September. The co-impacts of season and grazing intensity on the soluble sugar content were significant （P〈0.01）. The effect of the grazing intensity on the soluble sugar content was significant, but its affecting patter was not obvious due to season and climate.