[1]NING Husen,LUO Qinghong,JI Xiaomin,et al.Stoichiometry Characteristic on Carbon, Nitrogen, Phosphorus and Potassium of Ganjiahu Haloxylon ammodendron Stand in Xinjiang[J].Research of Soil and Water Conservation,2017,24(06):68-73.
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Stoichiometry Characteristic on Carbon, Nitrogen, Phosphorus and Potassium of Ganjiahu Haloxylon ammodendron Stand in Xinjiang
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
24
Number of periods:
2017 06
Page number:
68-73
Column:
Public date:
2017-11-24
- Title:
- Stoichiometry Characteristic on Carbon, Nitrogen, Phosphorus and Potassium of Ganjiahu Haloxylon ammodendron Stand in Xinjiang
- Keywords:
- Haloxylon ammodendron stand; vegetation coverage; nutrient element; ecological stiochiometry
- CLC:
- S714.5
- DOI:
- -
- Abstract:
- In Xinjiang Ganjiahu National Nature Reserve, Haloxylon ammodendron forest has degenerated in large areas, but the reason is still uncertain. Ecological stoichiometry is a new attempt in the unification of ecological theory that mainly focuses on element coupling relationship in the ecological process. So we want to study the ecological stoichiometric characteristics of nutrients in Ganjiahu H.ammodendron stand, reveal the nutrient restriction condition of this area and adaptation strategy of H.ammodendron, and then find out the solutions to protect H.ammodendron in Ganjiahu area. From the perspective of ecological stoichiometry, we took H.ammodendron stands with three different types of coverage (C ≥ 70%(HC),50% ≤ C < 70%(MC) and 30% ≤ C < 50%(LC)) in Xinjiang Ganjiahu National Nature Reserve as research site, then measured and analyzed the organic carbon(C), total nitrogen(N), total phosphorus (P) and total potassium (K) contents and their stoichiometric ratios in H.ammodendron (aboveground part and underground part) and soil (0-10 cm, 10-20 cm, 20-40 cm and 40-60 cm, 60-100 cm) of H.ammodendron stands. At the same time, we analyzed the relationship of nutrient in soil and plant. The result showed that:(1) there are differences of soil nutrient contents and their ratios among different types of coverage, change trends of organic C and N contents were similar:HC > MC > LC, and total P and total K contents were similar:HC > LC > MC, soil C:N was stable, soil C:P,C:K,N:P and K:N all had significant differences among different types of coverage, while soli K:P of three different types of coverage was not significantly different(p<0.05); (2) for aboveground part of H.ammodendron, N content and C:N of middle coverage were significantly higher than those in low coverage (p< 0.05);for underground part, C, N and P contents, C:N, N:P and K:N all had significant differences among different types of coverage, while content of K, C:N, C:P and K:P were not significantly different (p<0.05); when compared aboveground part with underground part of H.ammodendron, C content, C:N, C:P and C:K decreased in the order:underground part>aboveground part, while N, P, K contents, N:P, K:P and K:N decreased in the order:aboveground part>underground part; (3) most of the correlation of nutrient contents in aboveground part and soil were negative and the correlation coefficients were small; most of the correlation of nutrient contents in underground part and soil were positive and the correlation coefficients were larger; when it came to the relationship of nutrient content and stoichiometic ratios in aboveground and underground part of H.ammodendron, except for the C and P contents were negatively correlated, the rest were positively correlated, and C:N and K:N were significantly positively correlated (p<0.05). In conclusions, the soil nutrients in this region are poor; especially N and P are low. H.ammodendron is mainly limited by N. Soil has greater impact on root of H.ammodendron and plant nutrition elements have certain proportional relationship in the process of assimilation.
- References:
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1900-01-01