安太堡煤矿复垦区刺槐径向生长对气候因子的响应

Response of Radial Growth of Robinia Pseudoacacia to Climatic Factors in Reclamation Area of Antaibao Coal Mine

在全球变暖的背景下,区域干旱化程度加强,严重限制了干旱和半干旱地区树木的生长。安太堡矿区位于农牧交错带,生态环境脆弱,对气候变化敏感。通过树木年代学研究方法,建立了安太堡煤矿复垦区人工刺槐林(Robinia pseudoacacia)的树轮宽度标准年表,树轮气候响应分析发现水分是限制研究区刺槐生长的主要因素,上一年9月至当年8月的水文年降水以及主要生长季(6~8月)的降水对树木的生长有重要的促进作用,但是当年9月降水有限制作用;生长季前冬季(12月、1月)的较高温度也是限制刺槐径向生长的重要因素。

In the context of global warming,the degree of regional drought has intensified,which has seriously limited the growth of trees in arid and semi-arid areas.The Antaibao mining area is located in the agro-pastoral ecotone of China.The ecological environment is fragile and sensitive to climate change.Based on the method of dendrochronology,the standard chronology of tree-ring width of Robinia pseudoacacia forest in Antaibao coal mine reclamation area was established.The analysis of tree-ring climate response shows that water is the main factor limiting the growth of R.pseudoacacia in the study area.The precipitation in the hydrological year from September to August of the previous year and the precipitation in the main growing season(June-August)plays an important role in promoting the growth of trees,but the precipitation in September of the current year has a limiting effect.The higher temperature in the winter before the growing season(December and January)is also an important factor limiting the radial growth of R.pseudoacacia.