A close correlation exists between soil aggregation and soil organic carbon sequestration. Soil organic matter is the main material needed in the formation of soil aggregates and soil aggregates provide a place for soil organic matter to sequester carbon. The effects of different revegetation types on the aggregation of soil particles, the stability of soil aggregates, as well as carbon and fractions in soil aggregates were studied in a loess hilly鄄gully area; soil organic carbon and fraction忆s micro鄄response to different revegetation types are discussed. The results show the distribution of soil aggregates has a " V冶 distribution under a variety of revegetation and restoration measures. Small (< 0. 25 mm) and large (> 5. 0 mm) particle sizes form the most aggregates. The next largest aggregate size classes were 2-5 mm and 0. 25-1. 0 mm,
The balance between various elements of the ecosystem has been the focus of research related to the ecology of global change and biogeochemical cycles. Ecological stoichiometry is the study of the balance of energy and elements in biological systems and is based on the general laws of physics, chemistry and biology. Ecological stoichiometry provides an integrated approach to investigating the stoichiometric relationships and rules in biogeochemical cycling and ecological processes. Robinia pseudoacacia, a leguminous tree, is the main species used for afforestation in the Loess Plateau of China. R. pseudoacacia has some special features, such as a rapid growth, being easy to propagate, being very adaptable to various environmental conditions and an strong ability to fix nitrogen in a biologically useful form, allowing it to be widely planted in the Loess Plateau. To explore ecological stoichiometric characteristics of leaf litter of R. pseudoacacia in the Loess Plateau, R. pseudoacacia forests scattered across 12 counties (listed below) on both sunny and shady slopes were selected for study.
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