Variation in Soil Acidity in Larch Plantations in Eastern Montane Area of Northeast China and its Effect on Soil Phosphorus Forms

Abstract:

Variations in SA in various stands of first rotation larch plantation (FRLP) at different development stages (DDS), and in young stand (YS) of second rotation larch plantation (SRLP) in eastern montane area of northeast China and the relationship between SA and various forms of OP and IP were studied. Our results demonstrated that soil active acidity (pH value, SAA) in rhizosphere soil (RS) decreased continually with increasing stand ages from YS, half-mature stand (HMS), near mature stand (NMS) to mature stand (MS), but SAA in non-rhizosphere soil (NRS), exchange acidity (EA), exchangeable aluminium (EAL), total hydrolytic acidity (THA), and the ratio of EA to THA in RS and NRS increased apparently; when SA increased, total organic phosphorus (TOP), moderately resistant organic phosphorus (MROP), and highly resistant organic phosphorus (HROP) decreased in all stands of FRLP. For all stands except in HMS, when EA in RS increased, TOP, MROP, and HROP decreased. The correlation between labile organic phosphorus (LOP) and SAA, THA in RS reached highly significant level (HSL) at P=0.01 or significant level (SL) at P=0.05, respectively. Correlation coefficient (CC) between LOP and THA in RS diminished as stand ages increased. Positive correlation between moderately liable organic phosphorus (MLOP) and SAA in RS reached SL at P=0.05 or HSL at P=0.01 in all stands. In most stands, the close correlation existed between MROP and soil potential acidity (SPA), and between HROP and SPA, respectively.

• Periodical: Advanced Materials Research (Volumes 518-523)
• Pages: 4796-4800
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.518-523.4796
• Online since: May 2012
• Authors: Li Xin Chen, Wen Biao Duan, Jing Hua Wang
• Keywords: Develpoment Stages, First Rotation Larch Plantation (FRLF), Inorganic Phosphorus (IP), Organic Phosphorus (OP), Phosphorus Forms, Second Rotation Larch Plantation (SRLF), Soil Acidity (SA)

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