山西省太谷县不同退耕还林模式生态效应研究

Ecological Effects of Different Models of Conversion of Farmland to Forest at TaiguCounty of Shanxi Province

以撂荒地作为对照,通过野外采样、定点观测、室内试验,研究了山西省太谷县不同退耕还林模式的生态效应。结果表明:不同退耕还林模式生态效应是不同的,刺槐+山桃>刺槐>山桃林>撂荒地;刺槐+山桃、刺槐、山桃林负氧离子浓度分别为2019、1893、1738个/cm^3,是撂荒地的1.86倍;负氧离子寿命分别为17.35、16.28、14.94 min,是撂荒地的1.96倍;PM_(2.5)浓度分别为59.07、65.77、73.36μg/m^3,是撂荒地的0.65倍;土壤容重分别为1.15、1.17、1.19 g/cm^3,是撂荒地的0.80倍;土壤总孔隙度分别为49.60%、48.94%、47.57%,是撂荒地的1.24倍;土壤非毛管孔隙度分别为7.16%、6.77%、6.17%,是撂荒地的1.43倍;土壤有机质分别为2.93%、2.71%、2.53%,是撂荒地的1.42倍,土壤表层日较差分别为11.63、11.77、11.85℃,是撂荒地的0.80倍。

Taking the wasteland as a control, the ecological effects of different returning farmland to forest models in Taigu County, Shanxi Province were studied through field sampling, fixed-point observation and laboratory experiments.The results show that different models of conversion of farmland to forest have made different response to ecological effects.The order of ecological effectswas as follows: mixture of robinia pseudoacaciaand mountain peach>robinia pseudoacacia>mountain peach>abandoned land. According to the order of mixture of robinia pseudoacaciaand mountain peach, robinia pseudoacacia, mountain peach,the concentration of negative oxygen ionsrespectively were2019, 1893, 1738pieces/cm 3, 1.86 times of layland;the longevity of negative oxygen ions respectively were 17.35 , 16.28, 14.94min, 1.96 times of layland;the concentration of PM 2.5 respectively were 59.07, 65.77, 73.36 μg/m^3, 0.65 times of layland;the volume weight of soil respectively were 1.15, 1.17, 1.19g/cm ^3, 0.80 times of layland;soil total porosity respectively were 49.60%, 48.94%, 47.57%, 1.24 times of layland;soil non-capillary porosity respectively were 7.16%, 6.77%, 6.17%, 1.43 times of layland;soil organic matter respectively were 2.93%, 2.71%, 2.53%, 1.42 times of layland;daily temperature-range of surface soilrespectively were11.63, 11.77 , 11.85℃, 0.80times that of layland.