Influence Of Forest Succession And Tree Species On Fungi Mycelium Combined Carbon And Soil Physicochemical Properties

Soil from different successional stage of korean pine-broadleaf forests(10.4-400year), farmland and variable plantations returned from farmlands (Larix gmelinii, Franxinus mandshurica, Juglans mandshurica, Quercus mongolica, Berula platyphylla) in NE China were chosen as the materials for this paper. The arbuscular mycorrhizal fungi-related protein—Glomalin-related soil protein (GRSP), soil organic carbon (SOC), soil inorganic carbon (SIC), soil total nitrogen (N), alkali hydrolizible nitrogen (Alkali-N), soil total phosphorus (P), soil total potassium (K), soil available P, soil available K, pH value, electrical conductivity (EC) and bulk density were determined. The aim of this paper is to check the influeneces of vegetation success, farmland-retruning and tree species on these soil parameters, and we hyphothesize that GRSP-related fungi together with variable soil properties may significant changed during these processes, and these fungi-related changes both in quantity and quanlity are important soil fertility maintenance. Following conclusions were got:1. Vegetation succession could significant affect the content of easily extracted-GRSP (EE-GRSP) and total GRSP (T-GRSP), and linear increases were mainly observed in soils deeper than10cm, accompanying with significant changes in variable soil properties. Returning farmland to forests could significant affected EE-GRSP and T-GRSP, too. On average, the improvement in EE-GRSP was14%(P<0.05), while the enhancement in T-GRS was31%(P<0.05). These data showed that vergetion succession including returning farmland to forest had important effects on fungi-related carbon, soil fertility and carbon sequestration capacity.2. The differences of tree species had great effects on EE-GRSP, T-GRSP, SOM, SIC, total N, total P, total K, rapidly available P, rapidly available K, pH and EC. EE-GRSP and T-GRSP content of the Betula platyphylla forest, Juglans mandshurica forest were significant higher than Quercus mongolica and Fraxinus mandshurica forests; SOM and total N in Quercus mongolica forest were significant lower than other kinds of forests; pH in Fraxinus mandshurica forest was significantly higher than other forests. The large differences amont tree species should be one reason for the observation of most non-significant differences before and after farmland-returning. Our results manifested that selection of the appropriate tree could increase soil carbon sequestration capacity and maintain soil fertility.3. EE-GRSP and T-GRSP had significant correlations with SOC (soil organic carbon), total N(Nitrogen), total P (Phosphorous), soil total potassium (K) and soil available K. This finding shows GRSP-related soil arbuscular fungi had very important regulating effects on soil fertility and soil carbon sequestration capacity. However, this regulation function could be modified by tree species and retruning practices.4. Besides the influences on total amount of GRSP, vegetation succession also affected the quality of GRSP. This changes were mainly on functional group traits increase with successional times with few exception. GRSP-fluorence desinty usually lower in57.6-250year stage compared with others, while the absorptance (OD) values from ultraviolet spectrum were significant different among different succestional stages. However, we observed quite similar over-all shape of fluorescene spectrum and peak postion(380nm); The similar shape and peak postion were also observed in ltraviolet spectrum (294nm) and Fourier transform infrared spectrum and X-Ray spectrum.5. In all, above-mentioned data manifested that vegetation succession and tree species different could affect the quantity and quality of GRSP-related soil fungi, and this changes could affect soil fertility and soil C sequestration via their significant correlations.