CAJ | 학술논문

中国具有治理和修复潜力的滨海滩涂盐土面积约为2000 hm2.滨海滩涂盐土作为新成土壤,土体发育不明显、理化性状差、肥力水平低下.该文通过对东台境内表层土壤有机碳的采样分析,在 ArcGIS 地理信息系统及SPSS16.0系统平台上,利用地统计分析模块中的克里格法分析东台市表层土壤有机碳的空间变异规律,并分析不同滩涂围垦年限下表层土壤有机碳、总氮、pH 值、EC1:5的变化特征及其相关关系,结果显示滨海表层土壤有机碳含量与总氮、围垦年限呈极显著正相关,相关系数r分别为0.959和0.749,与pH值、电导率EC1:5呈极显著负相关,相关系数r分别为-0.478和-0.649.围垦3 a以上表层土壤有机碳可增加0.24%左右,总氮质量分数增加0.02%左右;围垦时间大于52 a,有机碳质量分数自0.1%增加到1.6%,全氮质量分数自0.03%增加到0.12%,养分等级也相应从6级增加到3级.该文研究表明,滨海盐土随着围垦年限的增长,土壤碳储量与总氮含量随之增加、pH值与EC1:5随之降低,耕地质量也相应提高.
중국구유치리화수복잠력적빈해탄도염토면적약위2000 hm2.빈해탄도염토작위신성토양,토체발육불명현、이화성상차、비력수평저하.해문통과대동태경내표층토양유궤탄적채양분석,재 ArcGIS 지리신식계통급SPSS16.0계통평태상,이용지통계분석모괴중적극리격법분석동태시표층토양유궤탄적공간변이규률,병분석불동탄도위은년한하표층토양유궤탄、총담、pH 치、EC1:5적변화특정급기상관관계,결과현시빈해표층토양유궤탄함량여총담、위은년한정겁현저정상관,상관계수r분별위0.959화0.749,여pH치、전도솔EC1:5정겁현저부상관,상관계수r분별위-0.478화-0.649.위은3 a이상표층토양유궤탄가증가0.24%좌우,총담질량분수증가0.02%좌우;위은시간대우52 a,유궤탄질량분수자0.1%증가도1.6%,전담질량분수자0.03%증가도0.12%,양분등급야상응종6급증가도3급.해문연구표명,빈해염토수착위은년한적증장,토양탄저량여총담함량수지증가、pH치여EC1:5수지강저,경지질량야상응제고.
With the impact of global climate change, the concern with ecosystem carbon sources and sinks has been growing. Soil carbon pool is the largest terrestrial ecosystem and the turnaround time is the slowest, which is the important factors controlling the size of the CO2 concentration in the atmosphere. Coastal saline soils is a kind of neoformative soils which has poor soil physical and chemical properties and low level fertility. There are approximately 2,000 hectares in China, which means a large potential soil carbon pool. In this study, the surface soil organic carbon content (SOC) was analyzed through soil samplings within the Dongtai county, which is located in the middle and lower reaches of the Yangtze River Plain, with beach area of 156 hm2. There are different seawalls of ages from ancient times. With the geographic information system (GIS) method and SPSS 16.0 system, the spatial variations of surface SOC were investigated, which turned out a strong relationship with the seawall inning line, the lowest near the sea, and increasing from the beach to the inland. The correlations of the surface SOC, total nitrogen content (TN), pH value, EC1:5 values under different beach reclamation ages were analyzed. The results showed that there was a significant positive correlation (P<0.01) between SOC and TN, reclamation ages, and the correlation coefficients (r) are 0.959 and 0.749, respectively. Meanwhile, a significant negative correlation (P<0.01) was presented between SOC and EC1:5, pH value, the correlation coefficients were-0.478 and-0.649, respectively. High EC1:5 and pH value were significant features of coastal saline soils, which limited the growth and reproduction of soil microorganism, fauna and flora, as well as the accumulation of organic matters. With more than 3 years of reclamation, under natural vegetation succession or human agricultural use, especially after irrigation and other agricultural production activity, the soil salinity reduced greatly, and the surface SOC and TN can increased about 0.24% and 0.02% respectively, comparing with the values before reclamation. After 52 years reclamation, the surface SOC increased from 0.1%to 1.6%, the TN increased from 0.03%to 0.12%. While the nutrient level increased from six class to three class accordingly. This study indicated that the EC1:5 and pH value decreased with the increasing reclamation period, and soil carbon storage and total nitrogen content increased with the increasing reclamation period. Therefore, the quality of coastal saline soils was improved through reclamation process.