【作者】 龚霞； 陈伏生； 赵晓蕊； 黄尚书； 牛德奎； 刘苑秋； 胡冬南； 李志； 张文元； 郭晓敏；

【Author】 Gong Xia 1 , Chen Fu-sheng 2 , Zhao Xiao-rui 1 , Huang Shang-shu 2 , Li Zhi 3 , Niu De-kui 2 , Liu Yuan-qiu 3 , Zhang Wen-yuan 3 , Guo Xiao-min 3** 1 College of Science,Jiangxi Agricultural University, Nanchang 330045, China 2 College of land and environment,Jiangxi Agricultural University, Nanchang 330045, China 3 College of Forestry,Jiangxi Agricultural University, Nanchang 330045, China

【机构】 江西农业大学理学院； 江西农业大学国土学院； 江西农业大学园林与艺术学院；

【摘要】 本文在江西泰和亚热带红壤森林恢复长期定位试验基地中,随机选取未被人为破坏、土壤和地形均一的湿地松(Pinus elliottii)纯林、湿地松(Pinus elliottii)-枫香(Liquidambar fomosana)混交林、枫香(Liquidambar fomosana)纯林和自然恢复的荒草地(对照)为研究对象,每种植被类型各设置3块20m×20m的样方,以森林根际与非根际土壤磷素及其有效性为研究内容,阐明亚热带丘陵红壤区不同植被类型和不同土壤深度的土壤磷素的分异性,为退化丘陵红壤区的生态恢复提供科学依据。主要研究结果如下:1、退化丘陵红壤区植被恢复显著改变了林地土壤磷素有效性。相对于自然恢复的荒草地,植树造林19年后的林地土壤有效磷、微生物量磷和有机磷显著提高,且均呈表聚性。湿地松-枫香混交林和枫香纯林土壤有效磷、微生物量磷和有机磷含量显著高于湿地松纯林;2、造林地土壤氧磷、钙磷和全磷含量显著低于荒草地,但铝磷和铁磷含量反之;3、造林树种根际土壤有效磷和微生物量磷含量显著高于非根际土壤;4、土壤有效磷与铝磷、铁磷、有机磷和微生物量磷呈显著正相关。推断土壤有机磷、微生物量磷、铝磷、铁磷是红壤区林地土壤有效磷的潜在来源。在南方退化红壤上应用造林措施恢复植被有助于提高土壤活性磷的供应,特别是增加铝磷和铁磷等无机磷的积累;改良效果表现为为阔叶纯林和针阔混交林优于针叶纯林。更多还原

【Abstract】 Three types of undisturbed and homogeneous landform forests, namely, Pinus elleottii forest, Liquidambar formosana forest, P. elliotti-L. formosana forest and naturally restored grassland (control) were randomly selected from the long-term reforestation experimental sites in Jiangxi Province. Three plots with the size of 20m×20m squares were set in each vegetation type. The purposes of this study are to clarify the differences in P and its’ availability of soils under different vegetation types and different soil depths in hilly red soil of subtropical region; and to evaluate the advantages and disadvantages in artificial afforestation in hilly red soil of mid-subtropical region. The main research results were as follows: 1. Vegetation restoration in degraded hilly red soil region has greatly changed soil P availability. In contrast to naturally restored grassland (control), the available P, microbial biomass P and organic P in 19-year-old forest soil were improved significantly, and surface gathering was found from each P. Soil available P and microbial biomass P in Liquidambar formosana forest and P. elliotti-L. formosana forest were significantly greater than those in Pinus elleottii forest; 2. O-P, Ca-P and total P in planting sites were significantly lower than those in naturally restored grassland, but an opposite trend was noticed for Al-P and Fe-P;3.Microbial biomass P and available P in rhizosphere soil of plantations were significantly greater than that in non-rhizosphere soil; 4. Soil available P was positively correlated with Al-P, Fe-P, organic P and microbial soil biomass P, suggesting that soil organic P, microbial biomass P, Al-P, Fe-P were potential resources of soil available P in forest soil of red soil region. Revegetation in degraded red soil would be helpful in improving accommodating soil activated P, especially in increasing the integration of Al-P and Fe-P. Better improvement effect was achieved in the broad-leaved forest and broad-leaved and conniferous mixed forest than in coniferous forest.更多还原