The content of soil aggregation ( > 2 . 0mm ) in 0 - 20cm profile is higher than fallow land ' s and carag 而土壤容重值仍然较大，稳定入渗速率ki 。也远远小于撂荒地及柠条地。
2.
Nutrient content in surface runoff and sediment was highest in the beginning of surface runoff , and then became stable ( 2 )撂荒荒坡、林草间作和造林林地沉淀泥沙中的全氮、全磷、全钾和有机质含量高于其它3种利用方式。
3.
Once this happens the site is abandoned and the soil is exposed to sun and rain , resulting in erosion and further impoverishment of the soil 如果土地就撂荒了,土壤直接暴露中日晒雨淋中,导致水土流失和土壤进一步贫瘠
4.
The species richness of wild vascular plants on the six pre - islands was 126 , 157 , 175 , 189 , 242 , and 254 , respectively 主要表现为森林比重很小，群落多样性低，撂荒地上处于次生演替初始阶段的杂类草草丛占了相当大的比例。
5.
A filed study on soil nutrient loss of different slope landuse types in the xiaolangdi gorges reservoir area was conducted under simulated rainfall 摘要通过野外模拟降雨试验，分析了撂荒荒坡、林草间作、农林间作、造林林地和坡耕地翻耕种植玉米、坡耕地翻耕休闲6种利用方式下的土壤流失特征。
6.
The content of soil nutrients in 0 - 20cm profile is higher than that of 20 - 60cm profile . in the s . viciifolia plot , there are more organic matter , the whole nitrogen , quik - result nitrogen , quik - result kalium 狼牙刺各样地内， o一zocm剖面土壤养分高于20一6ocm ，土壤有机质、全氮、碱解氮高于对照撂荒地。
7.
Results showed that available k and ( no3 ) ^ ( - 1 ) content were higher in surface runoff in slope cropland and intercrop land between crop and forestry than those in fallow land , intercrop land between forest and grass and afforestation land 研究结果表明： ( 1 )坡耕地及农林间作下地表径流中的有效钾和硝态氮含量高于撂荒荒坡、林草间作和造林林地。
8.
The average of shannon - wiener diversity index was 1 . 5481 in typical steppe abandoned land , which was only 55 % of natural grassland , while it was 1 . 3492 in meadow steppe abandoned steppe 典型草原撂荒地shannon - wiener多样性指数的平均值为1 . 5481 ，是天然草地的55 ，草甸草原带撂荒地shannon - wiener多样性指数的平均值为1 . 3492 ，是天然草地的50 。
9.
Because of the influence of climate undulation and desertification , this area gradually formed diversified economic types which had principal extensive agriculture and auxiliary hunting , fishing , gathering during the period of hongshan culture 受气候波动及沙地的影响，红山文化时期逐渐在这一地区形成了撂荒轮作式粗放型农业为主渔猎、采集为辅的多样化经济模式。
10.
With the increase of abandoned time , perennial plants increased , the function communities were richer , p diversity index in two communities reduced with abandoned interval , but the vegetation restoration was slow , the land abandoned for 30 years have not got to climax community 随撂荒年限的增加，多年生植物的种类和数量逐渐增加，植物群落功能群构成逐渐丰富，群落间多样性指数随撂荒时间间隔的增大而逐渐减小。但植被恢复缓慢，撂荒30年仍未达到顶极群落阶段。
