JOURNAL OF NATURAL RESOURCES ›› 2017, Vol. 32 ›› Issue (6): 1043-1052.doi: 10.11849/zrzyxb.20160585

• Resource Evaluation • Previous Articles     Next Articles

Ecological Stoichiometric Characteristics of Main Forest Stands in Ziwuling Forest Region on the Loess Plateau, China

ZHANG Hai-xina, ZENG Quan-chaoa, AN Shao-shanb, BAI Xue-juana, WANG Bao-ronga   

  1. a. College of Natural Resources and Environment, Yangling 712100, China;
    b. Institute of Soil and Water Conservation, Northwest A & F University, Yangling 712100, China
  • Received:2016-06-06 Revised:2016-08-03 Online:2017-06-20 Published:2017-06-20
  • Supported by:

    National Natural Science Foundation of China, No. 41171226; MWR Nonprofit Industry Research and Special Project Funds, No. 201501045; New Century Excellent Talents, No. NCET-12-0479.

Abstract:

To analyze carbon (C), nitrogen (N), phosphorus (P) and ecological stoichiometric characteristics in green leaf, litter, dead branch and fruit, four forest stands of different species (Platycladus orientalis, Pinus tabuliformis, Quercus wutaishanica and Robinia pseudoacacia L) in Ziwuling forest area on Loess Plateau were collected. The C, N, P contents and C∶N, C∶P, N∶P ratios were measured, and the variations of them were explored in the four forest stands. The results showed that N, P contents of plant were transferred before plant leaf withering and falling, and the resorption efficiencies of various nutrient elements were different. In this study, the highest resorption efficiency of N nutrient was 44.73% (Pinus tabuliformis), the highest resorption efficiency of P nutrient was 41.10% (Robinia pseudoacacia L), respectively. In addition, in Ziwuling forest area, the C content of green leaf under Robinia pseudoacacia L forest was 413.94 g·kg-1, which was a little lower than that of other forest stands. However, the N contents of green leaf, litter, dead branch and fruit under Robinia pseudoacacia L forest were 29.74, 17.10, 8.59, and 24.79 g·kg-1, which were slightly higher than the corresponding components of other forest stands; the P contents of green leaf and fruit under Robinia pseudoacacia L forest were 2.43 and 2.53 g·kg-1, which were higher than the corresponding components of other forest stands. The carbon accumulation capacities of these four forest stands were large. The resorption efficiencies of Pinus tabuliformis and Robinia pseudoacacia L were greater than that of Quercus wutaishanica and Platycladus orientalis. The C∶N, C∶P and N∶P ratios indicated that C accumulation was strong and that N, P nutrient were restricted by its ecosystem condition. The C∶N, C∶P ratios in dead branch were higher than the ratios in other components of the four species of plants. The N∶P ratios in green leaf of the four forest stands were all smaller than 14, showing that carbon accumulation capacity of dead branch was strong and the growth of the four forest stands were limited by N. This study found that Pinus tabuliformis and Robinia pseudoacacia L were more suitable for forest vegetation restoration on the Loess Plateau, China.

Key words: dead branch, ecological stoichiometry, fruit, green leaf, litter, nutrient resorption efficiency, Ziwuling Mountain

CLC Number: 

  • S718.5