马尾松苗木根系生长的养分-密度耦合效应

doi:10.16843/j.sswc.2019.01.006

Abstract
Figure/Table
References (0)
Related Citation (15)

Download: PDF (1049 KB) HTML (1 KB)
Export: BibTeX | EndNote (RIS)

Abstract [Background] Root system plays key role in soil and water conservation, while coupling effect of planting density and soil nutrient on the root growth of plant remains unclear. Pinus massoniana is a dominant tree species in Guizhou province, and thus selected as study material in this study. This work aims to clarify 2 questions:1) the response mechanism of P. massoniana seedlings roots to planting density and soil nutrients; and 2) the mechanism or effect of planting density-nutrient coupling among roots of P. massoniana seedlings.[Methods] The pot experiment was carried out in this study, 6 planting densities (1-6 Trees/pot) and 6 soil types (A₀-A₅) were set to explore the growth of P. massoniana roots, A0-A5 consisted of different ratio of layer A (leaching layer) and layer B (deposition layer), and their nutrients were in order:A₀ < A₁ < A₂ < A₃ < A₄ < A₅. Root morphology indexes, including root length, root surface area, root volume, and root biomass, were analyzed by Expression 10000XL 1.0 and Win RHIZOC Pro 2004b, and the data were processed using Microsoft Excel 2013 and SPSS 20.0 software.[Results] Root surface area, root length, root volume and root biomass increased with the increase of soil nutrient, and were the maximum at planting density of 1 tree/pot. The total root length in the planting density 1 tree/pot was higher than that in planting density 6 trees/pot 30.7% (A₀), 64.5% (A₁), 51.2% (A₂), 67.3% (A₃), 54.7% (A₄) and 72.2% (A₅). The total root volume in planting density 1 tree/pot was higher than that in 6 trees/pot by 57.2% (A₀), 55.3% (A₁) than, 74.1% (A₂), 47.2% (A₃), 51.2% (A₄) and 65.2% (A₅). The competition intensity of roots in different soil nutrients showed as middle nutrient > high nutrient > low nutrient, and each nutrient had the highest competition index at planting density 6 trees/pot by 0.502 (A₀), 0.641 (A₁), 0.737 (A₂), 0.623 (A₃), 0.753 (A₄) and 0.629 (A₅). The correlation coefficient between total root length and soil nutrients was the largest (R²=0.945). Planting density had a greater impact on root growth than soil nutrients in the coupling effect of soil nutrient and planting density. There was a binary functional relationship between the two and the root system. The soil nutrient was positively correlated with root growth, and the positive correlation coefficient ranged in 0.044 and 1.436. The planting density was negatively correlated with root growth, and the negative correlation coefficient was in (-34.757) and (-1.901).[Conclusions] Under medium and medium planting density conditions, medium soil nutrient is more suitable for root growth of P. massoniana. There are other interactions between the roots of adjacent plants, which are hypothesized as inhibitory effects, the results of plant roots inhibiting the growth of adjacent roots. Increased soil nutrients weaken competition between roots, and increased planting density increases competition among roots. The binary density function can be used to explain the planting density and nutrient conditions suitable for root growth of P. massoniana.

Key words： Pinus massoniana planting density soil nutrient root system root competition coupling effect

Received: 26 July 2018

PACS:

S756

	Service

	E-mail this article
	Add to my bookshelf
	Add to citation manager
	E-mail Alert
	RSS
	Articles by authors
	YIN Xiaoai
	ZHOU Yunchao
	YE Lipeng

Cite this article:

YIN Xiaoai,ZHOU Yunchao,YE Lipeng. Nutrient-planting density coupling effect in the root growth of Pinus massoniana seedlings[J]. SSWC, 2019, 17(1): 39-47.

URL:

http://journal12.magtechjournal.com/Jweb_stbc/EN/10.16843/j.sswc.2019.01.006 OR http://journal12.magtechjournal.com/Jweb_stbc/EN/Y2019/V17/I1/39

[1]	张艳杰,温佐吾.不同造林密度马尾松人工林的根系生物量[J].林业科学,2011,47(3):75. ZHANG Yanjie, WEN Zuowu. Root biomass of Pinus massoniana plantation with different planting densities[J]. Forestry Science, 2011, 47(3):75.
[2]	蔡鲁,朱婉芮,王华田,等. 鲁中南山地6个造林树种根系形态的比较[J]. 中国水土保持科学,2015,13(2):83. CAI Lu, ZHU Wanrui, WANG Huatian, et al. Root morphology of six tree species in mountain area of middle south Shandong[J]. Science of Soil and Water Conservation, 2015, 13(2):83.
[3]	王平,王天慧,周道玮,等.植物地上竞争与地下竞争研究进展[J].生态学报,2007,27(8):3489. WANG Ping, WANG Tianhui, ZHOU Daowei, et al. Research progress on plant ground competition and underground competition[J].Acta Ecologica Sinica,2007,27(8):3489.
[4]	WEIGELT A, JOLLIFFE P. Indices of plant competition[J]. Journal of Ecology, 2003, 91(5):14.
[5]	CAMPBELL B D, GRIME J P. An experimental test of plant strategy theory[J]. Ecology, 1992, 73(1):15.
[6]	陈伟,薛立.根系间的相互作用:竞争与互利[J].生态学报,2004,24(6):1243. CHEN Wei, XUE Li. Root interactions:Competition and mutual benefit.[J]. Acta Ecologica Sinica, 2004, 24(6):1243.
[7]	SNAYDON R W. Replacement or additive designs for competition studies?[J]. Journal of Applied Ecology, 1991, 28(3):930.
[8]	KEDDY P A, TWOLAN-STRUTT L, WISHEU I C. Competitive effect and response rankings in 20 wetland plants:Are they consistent across three environments?[J]. Journal of Ecology, 1994, 82(3):635.
[9]	HE Yaping, FEI Shimin, CHEN Xiuming, et al. Effects of simulated planting density resources on the growth of Jatropha curcas seedlings[J]. Sichuan Forestry Science and Technology,2010,31(6):1.
[10]	叶立鹏. 马尾松根系生长的营养空间特征及固土机制研究[D].贵阳:贵州大学,2013:1. YE Lipeng. Research on the nutrient spatial characteristics of growing root system of Pinus massoniana and the mechanism of soil consolidation[D]. Guiyang:Guizhou University, 2013:1.
[11]	Ⅲ F S C, SHAVER G R. Individualistic growth response of tundra plant species to environmental manipulations in the field[J]. Ecology, 1985,66(2):564.
[12]	ROBINSON D. The responses of plants to non-uniform supplies of nutrients[J]. New Phytologist,2006(127):635.
[13]	任玫玫,杨华.长白山云冷杉林优势树种的竞争[J].应用生态学报,2016,27(10):3089. REN Meimei, YANG Hua. Competition of dominant tree species in spruce and fir forests in Changbai Mountains[J]. Chinese Journal of Applied Ecology, 2016,27(10):3089.
[14]	BLISS K M, JONES R H. Are competitive in-teractions influenced by spatial nutrient heterogeneity and root for-aging behavior?[J]. New Phytologist,2002(154):409.
[15]	GRIME J P. Plant strategies and vegetation processes[J]. Biologia Plantrum, 1979,23(4):254.
[16]	EISSENSTAT D, CALDWELL M. Seasonal timing of root growth in favorable microsites[J]. Ecology, 1988(69):870.
[17]	GOLDBERG DE, RAJANIEMI T, GUREVITCH J, et al. Empirical approaches to quantifying interaction intensity:Competition and facilitation along productivity gradients[J]. Ecology, 1999(80):1118.
[18]	CAHILL J F Jr. Fertilization effects on interactions between above-and belowground competition in an old field[J]. Ecology, 1999(80):466.
[19]	COOMES D A, GRUBB PJ. Impacts of root competition in forests and woodlands:A theoretical framework and re-view of experiments[J]. Ecological Monographs,2000(70):171.
[20]	SPELETA J F, DONOVAN L A. Fine root demography and morphology in response to soil resources availability among xeric and mesics and hill tree species[J]. Functional Ecology,2002(16):113.