Nitrogen, water content, phosphorus and active iron jointly regulate soil organic carbon in tropical acid red soil forest
Nitrogen, water content, phosphorus and active iron jointly regulate soil organic carbon in tropical acid red soil forest
复制标题
氮、水分、磷、活性铁共同调控热带酸性红壤林土壤有机碳
DOI：
10.1111/ejss.12966
复制
发表时间：
2020-06-30
影响因子：
4.2
通讯作者：
Huang, Wuping
中科院分区：
文献类型：
--
作者：
Bai, Jinyue;Zong, Mingming;Huang, Wuping
增加森林土壤有机碳（SOC）储量对于减少陆地生态系统二氧化碳（CO2）排放和减缓全球气候变化至关重要。虽然海拔、温度和降雨量对有机碳的影响已被广泛研究，但在实际的森林经营中，通过改变这些因素来增加SOC储量是困难的。采用分层法测定了西南酸性红壤区季风阔叶林0-140 <$cm土层的SOC、土壤理化性质、营养元素、重金属元素、土壤矿物和微生物生物量。通过对影响酸性红壤区森林土壤有机碳贮量的土壤因子进行识别，确定影响土壤有机碳贮量因子的权重，以期通过改变影响土壤有机碳贮量的主要土壤因子，提高森林经营中对土壤有机碳的保持能力。结果表明，影响该地区森林有机碳储量的土壤因子是全氮（N，22.7%）>土壤含水量（19.9%）>活性铁（包括结晶不良的铁，FeO，15.5%）> pH（9.5%）>磷（P，9.4%）>铝（Al，8.9%）>硅（Si，7.1%）>硫（S，6.8%）。在这些因子中，N、含水量、FeO和P是森林经营的实用因子，而pH、Al、Si和S则不是。土壤有机碳与土壤氮、水、活性铁、磷含量呈显著正相关（p <0.05）。在酸性红壤区，以活性铁为亮点，N、土壤含水量、P和活性铁共同调节森林SOC贮量。因此，在实际森林经营中，通过适当的N、P施肥和干旱年份及干旱季节的灌溉等措施，提高土壤N、水分含量，活化土壤中的非活性铁，可以增加土壤有机碳的储量。
Increasing forest soil organic carbon (SOC) storage is important for reducing carbon dioxide (CO2) emissions from terrestrial ecosystems and mitigating global climate change. Although the effects of altitude, temperature and rainfall on organic carbon have been studied extensively, it is difficult to increase SOC storage by changing these factors in actual forest management. This study determined the SOC, soil physical and chemical properties, nutrient elements, heavy metal elements, soil minerals and microbial biomass in the 0–140‐cm soil layer of the monsoon broad‐leaved forest in the acid red soil region of southwestern China by stratification. We tried to identify the soil factors affecting the SOC storage of the forest in the acid red soil region and determine the weights of the factors affecting the SOC, with the aim of improving the SOC retention capacity in forest management by changing the main soil factors affecting SOC storage. The results showed that the soil factors affecting the forest SOC storage in this area are total nitrogen (N, 22.7%) > soil water content (19.9%) > active iron (including poorly crystalline iron, Feo, 15.5%) > pH (9.5%) > phosphorus (P, 9.4%) > aluminium (Al, 8.9%) > silicon (Si, 7.1%) > sulphur (S, 6.8%). Of these factors, N, the water content, Feo, and P are practical factors for forest management, whereas the pH, Al, Si and S are not. SOC was significantly positively correlated with the soil N concentration, water content, active iron content and P concentration (p < .05). In acidic red soil areas, with active iron as the highlight, N, soil water content, phosphorus and active iron jointly regulate the forest SOC storage capacity. Consequently, in actual forest management, any measures to promote soil N and water content and to activate inactive iron can enhance the storage of SOC, as appropriate input of N and P fertiliser and irrigation in dry years and the dry season.