National Key Research and Development Program of China (No. 2016YFD0300801)
基于空间自相关理论，探讨黄淮海平原旱作农田土壤有机质含量的空间分布结构，以及有机质与土壤黏粒含量和容重的空间相关关系。结果表明：黄淮海旱作农田土壤不同土层有机质含量区域均值分别为20.11±6.46（0~10 cm），14.76±5.11（10~20 cm），9.96±4.14（20~30 cm），8.03±3.45（30~40 cm）g·kg-1，分别处在三级至五级水平；0~20 cm各土层中，高值区域主要分布在太行山山前平原、山东引黄灌区等传统农业生产地带，以及河南南部和安徽北部的砂姜黑土区。随着土层深度的增加，有机质含量的空间分布结构趋于明显，10~40 cm各土层中，河北平原和鲁西北地区呈现LL（低-低）/HL（高-低）型分布特征；河南和安徽地区主要为HH（高-高）/LH（低-高）型，但不同土层的具体分布差异较大。有机质含量与黏粒含量之间存在显著的数理相关关系，与容重之间关系并不明显；有机质/黏粒含量和有机质/容重的双变量局部空间自相关类型中，LL/HL型主要分布在河北平原和鲁西北地区，其中HL型在0~20 cm各土层中集中分布在太行山山前平原和山东引黄灌区地带，HH/LH型样点主要分布在河南和安徽地区，但不同土层具体分布差异明显。有机质与黏粒含量的空间自相关结构更明显；0~10 cm、10~20 cm土层较20~30 cm、30~40 cm土层的空间自相关结构更明显；农业管理措施及其地域差异性是造成各分布结构在空间水平方向及土壤垂直分层方向上差异化的重要原因。
[Objective] The Huang-Huai-Hai plain is one of the most important agricultural production bases in China. Nevertheless, there exists very little information on the current status of soil organic matter content in cultivated land across this area or on the in-depth analysis of spatial distribution characteristics for regional soil organic matter management.[Method] Based on the spatial autocorrelation theory and soil property data from 267 sample sites, this study investigated the spatial distribution structures of soil organic matter content in dry farmlands in the Huang-Huai-Hai plain and analyzed the spatial autocorrelations between organic matter and soil clay particle content/soil bulk density.[Result] The results showed that the regional average values of soil organic matter contents of dry farmlands in the Huang-Huai-Hai plain were 20.11±6.46(0~10 cm), 14.76±5.11(10~20 cm), 9.96±4.14(20~30 cm), and 8.03±3.45(30~40 cm)g·kg-1, which corresponded to levels 3 to 5. In the soil layers between 0~10 cm and 10~20 cm, the high-value areas were mainly distributed in the traditional agricultural production areas such as Piedmont plain of Taihang Mountain, and Yellow River Irrigation Area in Shandong, and lime concretion black soil areas in southern Henan and northern Anhui also included. As the depth of the soil layer increased, the spatial distribution structure of soil organic matter content became obvious. In the soil layers between 10~20 cm, 20~30 cm, and 30~40 cm, the Hebei plain and Northwestern Shandong showed LL(Low-Low)and HL(High-Low)distribution characteristics while Henan and Anhui regions mainly demonstrated HH(High-High)and LH(Low-High)type distributions. The specific distribution of spatial autocorrelation types in the different soil layers was different. Also, the mathematical relationship between the contents of soil organic matter and clay particles was significant(P<0.05), but there was no significant difference in the relationship between organic matter content and soil bulk density. Among the two-variable local spatial autocorrelation types; organic matter/clay particle content and organic matter/bulk density, (i)the LL/HL types were mainly distributed in Hebei plain and Northwestern Shandong region; (ii)the HL type was concentrated in the Piedmont plain of Taihang Mountain and Yellow River Irrigation Area in Shandong for 0~10 cm and 10~20 cm soil layers; and(iii)the HH/LH types were mainly distributed in Henan and Anhui, with a distinct distribution in the different soil layers.[Conclusion] Soil organic matter content in dry farmlands in the Huang-Huai-Hai plain showed apparent spatial autocorrelation characteristics. The spatial autocorrelation structure between soil organic matter content and clay content was more distinct. Importantly, the spatial autocorrelation structure in 0~10 cm and 10~20 cm soil layers was more obvious than that in 20~30 cm and 30~40 cm soil layers. The observed dissimilarities in distribution structure in the spatial horizontal and vertical soil layering directions were attributed to regional differences in agricultural management.
任频频,黄峰,李保国.黄淮海平原旱作农田土壤有机质含量的空间分异特征[J].土壤学报,2022,59(2):440-450. DOI:10.11766/trxb202006250335 REN Pinpin, HUANG Feng, LI Baoguo. Spatial Differentiation Characteristics of Soil Organic Matter in Dry Farmland in the Huang-Huai-Hai Plain[J]. Acta Pedologica Sinica,2022,59(2):440-450.复制