研究了刺槐、臭椿纯林及其混交林中不同土层在不同季节土壤酶活性的变化。结果表明:各林分间的土壤酶活性在各个季节和土层均表现出差异。经统计分析,土壤酶活性在土层中的分布有一定的规律性,总的来说,随着土层逐渐加深,土壤酶活性逐渐减弱。在树木生长表现和土壤酶活性发挥方面,混交林优于纯林。

Volatiles of different Chaenomeles sinensis cultivars in Shandong Province were investigated by means of HS-SPME coupled to GC/MS,and the fruit aroma of different cultivars was studied. Result showed that the 161 volatiles, belonging to 7 categories, were identified. Esters, alcohols and aldehydes are the major constituents. Ethyl alcohol, 3-methyl-4-oxo-pentanoic acid, acetic acid butyl ester, 2-methyl-butanoic acid ethyl ester, diethyl phthalate, (E,E)-2,4-Decadienal are the main volatiles from the 10 cultivars. Ethyl alcohol and (E,E)-2,4-Decadienal were the primary volatiles. Some unique and high relative content volatiles, playing an important role in the formation of specific aroma of different Chaenomeles sinensis cultivars, were detected from most cultivars. There were significant difference between volatile, relative contents and aromatic categories.