沙漠人工植被地上部分生长动态

对腾格里沙漠东南缘2种人工植被柠条和油蒿在4种配置方式下地上部分的生长动态进行了研究,结果表明:不同配置方式下它们的密度、高度、冠幅和生物量基本不变或略微呈下降趋势;油蒿新梢的年生长动态呈S型曲线,柠条新梢春季生长速度较快,7月份以后生长速度缓慢或基本停止生长;柠条、油蒿地上生物量和叶面积指数的年变化均表现为双峰型,4种配置方式下共有8种1年生植物入侵,并具有较高的植被盖度;同其它3个样地相比,纯油蒿样地1年生植物的密度、盖度和生物量明显偏低.

Dynamics of Aboveground Parts of Artificial Vegetations in Desert Region

The study investigated aboveground growths of Caragana korshinskii and Artemisia ordosica planted in four modes,revealing that in different planting modes their densities,heights and canopy width and biomasses remained unchanged or tended to decrease slightly;the young shoots of A.ordosica annually grew in a S-shaped cure and the young shoots of C.korshinskii grew fast in spring and grew slowly or cease to grow from July on;the biomasses and leaf area indexes of C.korshinskii and A.ordosica annually varied in a double-peak curve and there were 8 annual plants that invaded in the four planting modes and formed higher coverage;the quadrat with only A.ordosica appeared to have obviously lower coverage and biomass that the other three quadrats.