JOURNAL OF NATURAL RESOURCES ›› 2016, Vol. 31 ›› Issue (10): 1752-1763.doi: 10.11849/zrzyxb.20151216

• Resource Evaluation • Previous Articles     Next Articles

Plant and Soil C, N, P Stoichiometric Characteristics in Relation to Micro-topography in the Hilly Loess Plateau Region, China

RU Hai-li1, 2, ZHANG Hai-dong3, JIAO Feng1, 3, GUO Mei-li2, XUE Chao-yu3   

  1. 1. Institute of Soil and Water Conservation, Northwest A&F University, Yangling 712100, China;
    2. University of China Academy of Sciences, Beijing 100049, China;
    3. College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China
  • Received:2015-11-03 Revised:2016-02-26 Online:2016-10-20 Published:2016-10-20
  • Supported by:
    National Natural Science Foundation of China, No.41271043 and 31370455 National Key Research and Development Project, No.2016YFA0600801

Abstract: The research measured the carbon (C), nitrogen (N), phosphorus (P) content of plant leaf, root and soil at different slope aspects (sunny slope & shady slope) and different slope positions (top, upper, middle and lower) at Ansai Experiment Station. The effects of micro-topography on stoichiometric characteristics of plants and soil in the hilly Loess Plateau region were revealed. The results showed that the average leaf C, N and P contents were 433.47, 24.84 and 1.61 g/kg respectively, the leaf C/N, C/P and N/P stoichiometric ratios were 18.18, 320.36 and 17.41 respectively. The value of leaf N/P showed that the growth of plants was restricted by P in hilly Loess Plateau region. The root C, N and P contents were 380.05, 9.07 and 0.31 g/kg respectively, and the stoichiometric ratios of root C/N, C/P and N/P were 49.61, 1 326.64 and 30.73 respectively. Leaf and root C, N and P contents in shady slope were all greater than those in sunny slope, and those in top slope were the least. In shady slope, the C, N and P contents of leaf and root in different positions were in the order of lower slope > middle slope > upper slope > top slope. Soil C, N and P contents at different slope aspects were in the order of shady slope > sunny slope > top slope. Soil C, N and P contents concentrated in the 0-20 cm soil layer and decreased with soil depth. As the different part of biogeochemical cycle, plant and soil must have the contact. Correlation analysis showed that soil nutrients at different soil layers were correlated with the stoichiometric characteristics of leaf and root. Especially, the soil C, N and P contents at 0-20 cm layer had significantly positive correlation with leaf C, N and P contents (P<0.05), and also had significantly positive correlation with root N and P content (P<0.05), but had no significant correlation with root C content.

Key words: hilly Loess Plateau region, slope aspect, slope position, stoichiometric characteristics

CLC Number: 

  • S812.2