摘要
【目的】中国沙棘灌丛是川西高原岷江上游重要的植被类型,本文旨在了解岷江上游不同气候植被区域海拔对中国沙棘灌丛土壤养分的影响。【方法】在米亚罗和川主寺区域,分别测定了2450~3050m和2870~3550m海拔下土壤C、N、P含量及其比值。【结果】①2个区域C、N、P含量随海拔的变化有所差异,在米亚罗2900m以下随海拔升高而增加,以上呈波动变化,而在川主寺随海拔升高呈波动下降;②2个区域土壤C∶N和C∶P随着海拔升高的变化与C、N、P变化一致,而N∶P仅在川主寺与N相关,其随海拔变化与C、P无关;③2个区域土壤C、N、P化学计量中,碳含量均相对较高,具有较高的C∶N比值,磷元素相对偏多,具有较低N∶P;【结论】中国沙棘灌丛土壤养分随海拔变化的差异与不同区域降水量、温度以及植被差异有关,土壤养分中氮元素可能是一个重要的限制因子,根瘤菌的固氮作用是中国沙棘林下土壤氮源的重要补充。
【Objective】 Hippophae rhamnoides L., an important vegetation type in Upper Min River, plays an important role in ecological protection and the restoration and reconstruction of degraded ecosystem in the region. The present paper was conducted to understand the effect of elevation on soil nutrient content and stoichiometric characteristics under H. rhamnoides shrubs.【Method】The total organic carbon, total nitrogen, total phosphorus were measured, and the C ∶P, C ∶N, N ∶P were determined along the altitude of 2450-3050 m and 2870-3550 m in Miyaluo region and Chuanzhusi region.【Result】(i) C, N and P increased gradually below 2900 m with the increase of altitude, and undulate changed above 2900 m in Miyaluo, while in Chuanzhusi, C, N, P fluctuating decline with elevation;(ii) The change of C ∶N and C ∶P in the two regions was consistent with the changes of C, N and P, while N ∶P was only related to N in Chuanzhusi, it was not related to C and P with the change of altitude.(iii) in H. rhamnoides shrubs soil, the C ∶ N ∶ P stoichiometry showed more total organic carbon with relatively high C ∶ N ratio, and relatively more phosphorus content with low N ∶ P ratio;【Conclusion】The difference of nutrients with altitude in H. rhamnoides shrubs soil was related to the difference of precipitation, temperature and vegetation in different regions. Nitrogen might be an important limiting factor, thus the nitrogen fixation by Rhizobium in the root of H. rhamnoides was an important supplement to the soil nitrogen source in the forest.
作者
李玲
李森
邓东周
涂卫国
Vladimirov Dmitrii
LI Ling;LI Sen;DENG Dong-zhou;TU Wei-guo(Sichuan Provincial Institute of Natural Resource Sciences, Sichuan Chengdu 610015, China;Sichuan Academy of Forestry, Sichuan Chengdu 610081, China)
出处
《西南农业学报》
CSCD
北大核心
2019年第5期1098-1103,共6页
Southwest China Journal of Agricultural Sciences
基金
国家自然科学青年科学基金项目(31700536)
四川省科技计划项目(2015SZ0062)
四川省应用基础研究项目(2017JY0211)
关键词
川西高原
中国沙棘
土壤养分
海拔
化学计量
Western Sichuan Plateau
Hippophae rhamnoides L.
Soil nutrient
Altitude gradient
Stoichiometry characteristics
