摘要
为探究荒漠绿洲区域红枣经济林在不同空间区域、时间维度的滞尘能力,以荒漠绿洲城镇第一师十一团红枣经济林为研究对象,通过叶面尘收集、叶面积测定、洗脱过滤称重,采用质量差减法结合Digimizer软件及NOWAK经验公式测定红枣经济林单位叶面积、单叶、单株及单位种植面积滞尘能力,分析枣林时空分布特征、植株结构对滞尘效益的影响.结果表明:1)枣林单位叶面积滞尘量、单株滞尘量、单位土地面积滞尘量均值依次为4.86 g/m2、72.70 g/株、248.81 kg/hm2;2)枣林滞尘量的空间变化趋势表现为:在水平空间分布上单株滞尘量、单位叶面积滞尘量由绿洲内部到边缘呈先减少后增多趋势,单位枣林滞尘量随着距枣林边缘水平距离增加呈先增加后减少趋势;在垂直空间分布上,则随高度增加呈先增加后减少的趋势;3)在时间分布上,滞尘累积量随月份增加呈先增加后减少的趋势,6月表现最佳;4)枣林单株滞尘量(SP)与单位叶面积滞尘量(LA)、冠幅(CW)、冠高(CH)、三维绿量(DGP)间呈极显著正相关(P<0.01).研究结果可为塔里木盆地北缘荒漠绿洲城镇红枣经济林生态效益评估提供理论参考.
Abstract
The objective of this study was to investigate the dust retention capability of red jujube non-tim-ber plantations in desert oasis area in different spatial areas and time dimensions.The red jujube planta-tions in the oasis township of the 11th Regiment of the First Division of Xinjiang Production and Construc-tion Corps were selected as the research objects.After the procedures of leaf dust collection,leaf area meas-urement,elution filtration and weighing mass,difference subtraction method combined with Digimizer soft-ware and NOWAK empirical formula were used to determine the relative indices,such as dust retention capacities of per unit leaf area,per leaf,per plant and per unit planting area of jujube plantations.The effects of temporal and spatial distribution characteristics and plant structure on dust retention efficiency were analyzed.The results showed that 1)the average values of dust retention per unit leaf area,per plant,and per unit land area were 4.86 g/m2,72.70 g/plant and 248.81 kg/hm2,respectively.2)The spatial vari-ation trend of dust retention in jujube plantation was as follows:the dust retention per plant and per unit leaf area decreased first and then increased from the oasis interior to the edge,and the dust retention per unit jujube plantation increased first and then decreased with the increase of the horizontal distance from the edge of jujube plantation.The vertical spatial distribution increased first and then decreased with the increase of jujube tree height.3)In terms of time distribution,there was a trend of first increasing and then decreasing with the increase of months,and the dust retention benefit was the best in June.4)There was significant positive correlation between dust retention per plant and per unit leaf area,crown width,crown height and 3D green amount(P<0.01).The research results can provide theoretical references for ecologi-cal benefit assessment of jujube plantation in desert oasis township in the northern margin of Tarim Basin.
维普
万方数据