【摘要】 为分析地下水对民勤绿洲人工梭梭林生长的影响,本研究选取10年龄左右的人工梭梭林,分析地下水埋深和土壤含水率对梭梭生长的影响,结果表明:1)梭梭当年新枝生长量与地下水埋深之间呈显著负相关,与20-80cm层土壤含水率呈显著正相关。地下水埋深小于10m时,20-80cm层土壤含水率高于2%,梭梭生长旺盛,且当年新枝生长量随着地下水埋深的不断增大而逐渐减少,不同地下水埋深间当年新枝生长量差异显著,地下水是梭梭生长的关键因子;当地下水埋深超过10m时,20-80cm层土壤含水率随之小于2%,当年新枝生长量急剧减少,且不同地下水埋深间当年新枝生长量差异不显著,地下水对梭梭生长的影响非常小,梭梭基本处于生长不良或停滞状态。2)地下水埋深和土壤含水率对梭梭冠幅大小的影响趋势总体和当年新枝的生长量基本相同,但影响程度较当年新枝生长量轻,以地下水埋深10m为分界点,10m以内梭梭冠幅相对较大,不同地下水埋深间冠幅大小差异不显著;大于10m时梭梭冠幅较小,与小于10m的各分布区差异显著。同时梭梭冠幅的大小受生境等多种因素的影响。更多还原

【Abstract】 As the most widely distributed artificial sand-fixing forest in Minqin oasis, H. ammodendron forest plays an important role in protecting the ecological environment of Minqin oasis, but its decline and death are very serious. In this study, natural H. ammodendron forest of about 10 years old was selected to analyze the effect of groundwater depth and soil water content on the growth of artificial H. ammodendron forest. The results showed: There is a significant negative correlation between the growth of new branches and the groundwater depth, and a significant positive correlation between the growth of new branches and the soil water content in 20-80 cm layer. When the groundwater depth is less than 10 m, the soil water content in 20-80 cm layer is higher than 2%, H. ammodendron grows vigorously; the growth of new branches decreases gradually with the increase of groundwater depth, the difference is significant between different groundwater depth, so the groundwater depth plays a key role in the growth of H. ammodendron. When the groundwater depth is more than 10 m, the soil water content in 20-80 cm layer is lower than 2%, the growth of new branches of H. ammodendron decreases sharply, the difference is not significant between different groundwater depth, the groundwater depth makes little influence on the growth of H. ammodendron, the growth is basically stagnation. 2) The influence of groundwater depth and soil water content on the crown width of H. ammodendron shows the same trend with the growth of new branches, but the degree of influence is lower than the growth of new branches, there is a demarcation point of 10 m of groundwater depth, when the groundwater depth is less than 10 m, the crown width is relatively large, and the difference is not significant between different groundwater depth; when the groundwater depth is more than 10 m, the crown width is relatively small, and the difference is significant between less than 10 m. The crown width is influenced by many factors, such as habitat etc.更多还原