Li Y, Zu Y, Wang X
Yunnan Agricultural University, Kunming 650201.
Ying Yong Sheng Tai Xue Bao. 2001 Apr;12(2):223-5.
Under UV-B radiation, the CHO (soluble carbohydrate) concentration in leaves decreased significantly, while the concentrations of HCel (holocellulose) and protein in leaves and that of HCel in stems increased significantly. HCel concentration in roots did not change significantly. Under UV-B radiation, the colonization rates of Penicillium ochro-chloron and Aspergillus niger on leaves and stems increased significantly during growing phase, those of Trichoderma koningii and Aureobasidium pullulans were on the contrary, while that of Aspergillus terreus did not change obviously. After 60 and 100 days of decomposition, the decomposition rates of leaves and stems increased significantly. The decomposition rate of leaves was positively correlated with the concentration of HCel and soluble protein, but negatively with that of CHO. The decomposition rate of stems was also positively correlated with HCel concentration. Under enhanced UV-B radiation, the changes in chemical composition of spring wheat and in fungal colonization rate, and the increase in decomposition rates might resulted in a faster nutrient turnover in wheat field ecosystem and a higher nutrient storage in soil.
在UV - B辐射下，叶片中可溶性碳水化合物（CHO）浓度显著降低，而叶片中全纤维素（HCel）和蛋白质浓度以及茎中HCel浓度显著增加。根中HCel浓度变化不显著。在UV - B辐射下，在生长阶段，叶和茎上的黄绿青霉和黑曲霉定殖率显著增加，康宁木霉和出芽短梗霉的定殖率则相反，而土曲霉的定殖率变化不明显。经过60天和100天的分解后，叶和茎的分解率显著增加。叶的分解率与HCel和可溶性蛋白质浓度呈正相关，但与CHO浓度呈负相关。茎的分解率也与HCel浓度呈正相关。在增强UV - B辐射下，春小麦化学成分的变化、真菌定殖率的变化以及分解率的增加可能导致麦田生态系统中养分周转加快和土壤中养分储存增加。
