Long-term agricultural activity affects anthropogenic soil on the Chinese Loess Plateau

Abstract

Anthropogenic activities largely influence the soil quality of agricultural fields and the composition of soil. Samples of typical anthropogenic Loutu soil in the Guanzhong area of the Loess Plateau, Shaanxi Province, China were collected and measured for soil compaction, bulk density, total organic carbon (TOC), active organic carbon (AOC), and soil enzyme activities to investigate spatial variations in soil quality. The results indicate that soil compaction and bulk density increased with increasing distance from the farm village, whereas soil TOC, AOC, and soil enzyme activities firstly increased and subsequently decreased with increasing distance from the farm village. All of the tested parameters presented clear concentric distribution. Vertically, soil compaction and bulk density in the topsoil were lower than those in the subsoil, but all other tested parameters in the topsoil were significantly higher than those in the subsoil. In addition, there was a significant positive correlation between organic carbon content and enzyme activities, confirming that the spatial distribution of Loutu soil characteristics has been affected by long-term anthropogenic activities to some extent. The results of this study imply that the use of farmyard manure and appropriate deep plowing are important and effective ways to maintain and improve soil quality.

Ecological Function Service Value and Quantity of Fruit-Tree Economic Forests in the Semi-Arid Loess Hilly and Gully Region of Central Gansu—A Case Study of the Hulu River Basin

“…In this study, the fruit tree economic forest was selected as grade 5 (2≤index< 3) and water conservation forest as grade 4 (3≤index<4), and their corresponding values were calculated as 10000 yuan ha -1 yr -1 and 20000 yuan ha -1 yr -1 , respectively. The negative ion concentration values refer to the observed values of ) in the woodland of the Loess Plateau in the north of the Qinling Mountains in Shaanxi Province (Li et al, 2008).…”