Subjects: Biology >> Botany >> Applied botany submitted time 2024-03-26 Cooperative journals: 《广西植物》
Abstract： Phosphorus (P) is one of the essential elements for plant growth and is a key factor in maintaining the productivity of subtropical forest ecosystems. Chinese fir (Cunninghamia lanceolata) is mainly distributed in subtropical areas of China, and its soil acidification and phosphorus utilization efficiency are low. It is of great significance to study the effect of Chinese fir plantation transformation on soil P for the stability of ecosystem and sustainable forest management. In this study, the rhizosphere soil and non-rhizosphere soil were collected from the replanted Chinese fir plantation, Castanopsis hystrix plantation, Mytilaria laosensis plantation and the mixed plantation of Castanopsis hystrix and Mytilaria laosensis on the cutting-blank of Chinese fir plantation in South Asia, and the effects of soil P component and transformation on the transformation of Chinese fir plantation into broadleaved forest were studied. The results showed that: (1) The content of microbial biomass phosphorus and the activity of acid phosphatase in rhizosphere and non-rhizosphere soil of the modified Castanopsis hystrix plantation, Mytilaria laosensis plantation and the mixed plantation of Castanopsis hystrix and Mytilaria laosensis were significantly higher than those of Chinese fir plantation. Soil total phosphorus of Castanopsis hystrix plantation and the mixed plantation of C. hystrix and Mytilaria laosensis was more easily converted to quick available phosphorus than those of Chinese fir plantation and Mytilaria laosensis plantation. (2) The contents of calcium chloride extraction phosphorus in rhizosphere and non-rhizosphere soil of Castanopsis hystrix plantation and the mixed plantation of Castanopsis hystrix and Mytilaria laosensis were significantly higher than those of Chinese fir plantation and M. laosensis plantation, and the contents of enzyme extraction phosphorus, hydrochloric acid extraction phosphorus and citric acid extraction phosphorus in rhizosphere and non-rhizosphere soil of Mytilaria laosensis plantation and Castanopsis hystrix/Mytilaria laosensis mixed plantation were significantly higher than those of Chinese fir plantation and Castanopsis hystrix plantation. (3) RDA results showed that soil water content and microbial biomass carbon were the key factors regulating P components in rhizosphere and non-rhizosphere soils, respectively. In summary, the transformation of Chinese fir plantation into broadleaved forest is conducive to the storage and supply of forest soil P, and this study provides an important scientific basis for tree species selection and management strategies to improve soil P availability in south subtropical plantations.
Subjects: Biology >> Botany >> Applied botany submitted time 2024-01-03 Cooperative journals: 《广西植物》
QIN Huiting
YAN Jinliu
HUANG Haimei
LI Jiajun
XIANG Mingzhu
LI Changhang
HUANG Xueman
ZHAO Lijun
YOU Yeming
Abstract： Organic phosphorus (Po) is an important part of soil phosphorus reservoir. In order to investigate the effects of the soil Po fraction distribution properties in Pinus massoniana plantations after close to nature silviculture, we investigated the pure P. massoniana plantations (PP) and P. massoniana broad leaved mixed plantations (CP) after close to nature silviculture in southern subtropical China. After collecting 0~10 cm soil sample, it was screened into >2 mm, 0.25~2 mm and <0.25 mm particle size fractions using the dry sieving method. We measured the Po fraction, microbial biomass phosphorus (MBP) and acid phosphatase (ACP) activity in the bulk soil and aggregates to understand the distribution of the Po fraction and its drivers. The results were as follows: (1) Soil Po fractions changed in CP compared to PP, with highly recalcitrant organophosphorus (HRO P) and moderately labile organophosphorus (MLO P) markedly greater in the bulk soil and soil aggregates than in PP (P 0.05), while labile organophosphorus (LO P) and moderately recalcitrant organophosphorus (MRO P) were not significantly different in CP and PP. In addition, there was no consistent pattern of change in the Po fractions in the bulk soil and soil aggregates between PP and CP. (2) The size of the proportion of each form of Po in PP was HRO P>MRO P>MLO P>LO P, while CP was HRO P>MLO P>MRO P>LO P. (3) The MBP and ACP activity in CP was markedly greater than that of PP in the bulk soil and the soil aggregates, and there was a tendency for the ACP activity to increase with the decrease in the size of the aggregates. (4) Redundancy analysis revealed that soil available phosphorus (AP), mean weight diameter (MWD), MBP and total nitrogen (TN) were the main drivers of the soil Po fraction. In conclusion, the close to natural forest management model is beneficial to the accumulation and transformation of soil phosphorus in P. massoniana plantation. This study provides a theoretical basis for the improvement of soil quality and productivity in P. massoniana plantations.
Subjects: Biology >> Botany >> Applied botany submitted time 2020-08-03 Cooperative journals: 《广西植物》
Abstract：该研究以二代巨尾桉/降香黄檀混交林（MP）作为研究对象，并以邻接的二代巨尾桉纯林（PP）作为对照（CK），采用磷脂脂肪酸（PLFAs）和土壤酶活性分别表征土壤微生物群落结构和功能，重点探究南亚热带 PP 引入降香黄檀混交种植对土壤微生物群落结构和功能的影响。结果表明：与 PP 相比，（1）MP 的土壤有机碳（SOC）、总氮（TN）、铵态氮（NH4+-N）、硝态氮（NO3--N）和 pH 值分别显著或极显著增加了 61.92%（P<0.05）、60.12%（P<0.05）、72.87%（P<0.01）、488.49%（P<0.01）和 15.97%（P<0.05）；（2）MP 的真菌/细菌（F/B）显著降低，但总微生物生物量、革兰氏阴性菌/阳性菌（G-/G+）并无显著变化；（3）MP 的土壤微生物群落组成发生了显著变化，而 pH 值、NH4+-N 和 C/Nlitter是驱动其微生物群落组成发生变异的最显著性因子；（4）MP 的β-葡萄糖苷酶（BG）和 N-乙酰-葡萄糖苷酶（NAG）活性显著提高，而过氧化物酶（PER）活性显著降低，酚氧化酶（PO）和酸性磷酸酶（ACP）活性没有显著变化。该研究说明在连续短周期经营的桉树林中套种固氮树种降香黄檀，将可能是提高桉树林土壤质量的一种有效的经营管理措施。
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