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.
新疆甘家湖梭梭林碳、氮、磷、钾生态化学计量特征
- 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
- 分类号:
- S714.5
- 摘要:
- 为探讨甘家湖梭梭林的C，N，P，K元素化学计量特征，进而揭示该地区梭梭林的养分限制状况和适应策略，以新疆甘家湖国家级自然保护区3种植被盖度C ≥ 70%（HC），50% ≤ C < 70%（MC），30% ≤ C < 50%（LC）梭梭林为研究对象，从生态化学计量学角度，测定和分析土壤（0-10 cm，10-20 cm，20-40 cm，40-60 cm，60-100 cm）及梭梭标准木地上、地下部分中的有机碳、全氮、全磷和全钾的质量分数及计量比值。结果表明：（1）不同盖度梭梭林土壤营养元素及计量比存在差异，有机C和全N含量的变化规律基本相似：HC > MC > LC，全P和全K含量基本相似：HC>LC>MC。土壤C：N较为稳定，不同盖度梭梭林土壤C：P，C：K，N：P，K：N差异显著，而不同盖度梭梭林地K：P差异不显著（p<0.05）。（2）梭梭植株地上部分仅中盖度N含量和C：N显著高于低盖度（p<0.05）；梭梭植株地下部分C，N，P含量、C：N，N：P，K：N在不同盖度之间差异显著，而K含量、C：P，C：K和K：P在不同盖度之间差异不显著（p<0.05）。梭梭植株地上和地下部分相比，C含量、C：N，C：P和C：K为地下>地上，而N，P，K含量、N：P，K：P和K：N均为地上>地下。（3）植株地上部分营养元素与土壤中对应元素多为负相关关系且相关系数较小，而地下部分营养元素与土壤中对应元素则多为正相关关系且相关系数较大。梭梭地上和地下部分，除C和P为负相关外，其余均为正相关，且C：N和K：N为显著正相关（p<0.05）。综上得出，该地区土壤较为贫瘠，尤其N，P元素匮乏；梭梭生长主要受N限制；梭梭植株根系生长发育受土壤影响更大，植株体营养元素在同化过程中呈一定的比例关系。
- 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.
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备注/Memo
收稿日期:2016-11-09;改回日期:2017-01-05。
基金项目:“十二五”国家科技支撑计划项目“古尔班通古特沙漠绿洲防护体系与农牧业综合开发试验示范研究”（2012BAD16B0305）
作者简介:宁虎森(1966-),男,新疆焉耆县人,教授级高级工程师,研究方向:生态恢复和荒漠化防治。E-mail:ninghusen@sina.com