Water-use efficiency and its relationship with environmental and biological factors in a rubber plantation.

Pattern and driving factor of intense defoliation of rubber plantations in SW China.

• The effect of fog on rubber trees ( Hevea brasiliensis ) was quantified for 3 years. • Visibility, sap flux density and crop water productivity (WP c ) were studied. • Under the fog days, rubber trees were physiologically less active. • Carbon assimilation and evapotranspiration were suppressed but WP c enhanced by fog. • Dry seasonal fog can reduce water demand and alleviate drought stress. The rapid conversion of tropical rainforests into monoculture plantations of rubber ( Hevea brasiliensis ) in Southeast Asia (SEA) necessitates understanding of rubber tree physiology under local climatic conditions. Frequent fog immersion in the montane regions of SEA may affect the water and carbon budgets of the rubber trees and the plantation ecosystems. We studied the effect of fog on various plant physiological parameters in a mature rubber plantation in southwest China over 3 years. During the study period, an average of 141 fog events occurred every year, and the majority occurred during the dry season, when the temperature was relatively low. In addition to the low temperature, fog events were also associated with low vapor pressure deficit, atmospheric water potential, relative humidity and frequent wet-canopy conditions. We divided the dry season into cool dry (November-February) and hot dry (March-April) seasons and classified days into foggy (FG) and non-foggy (non-FG) days. During the FG days of the cool dry season, the physiological activities of the rubber trees were suppressed where carbon assimilation and evapotranspiration showed reductions of 4% and 15%, respectively, compared to the cool dry non-FG days. Importantly, the unequal declines in carbon assimilation and evapotranspiration led to enhanced crop water productivity (WP c ) on cool dry FG days but insignificant WP c values were found between FG and non-FG days of the hot dry season. Our results suggest that, by regulating plant physiology, fog events during the cool dry season significantly reduce water demand and alleviate water stress for the trees through improved WP c . 

Seasonal fog enhances crop water productivity in a tropical rubber plantation

Phenology-related water-use efficiency and its responses to site heterogeneity in rubber plantations in Southwest China

The yield of rubber tree is influenced by environmental factors and its own variety characteristics. In this study, a simulation model for the stem volume of standing rubber trees was developed. Compared to the general model, the RMSE and R values between the simulated and measured data were increased by 28.0% and 4.5%, respectively. Through analysis, the regression model Ydr1 (take the relative stem volume increment and climatic variables as independent variables), Ydr2 (take the climatic variables and disaster index as independent variables), and Ydr3 (take the relative stem volume increment, climatic variables and disaster index as independent variables) were established for the dry rubber yield prediction of a single plant. The result showed that, the RMSE and R values of the yield prediction model Ydr3 were 0.0354 kg and 0.9862, they increased by 76.8% and 32.6% with respect to the model Ydr2 and rose 66.8% and 17.4% compared to the yield prediction model Ydr1, respectively. In applying the prediction model Ydr3 to the yield prediction in different sub-compartments of a rubber plantations, the mean absolute error was 35.7 kg/ha. This study’s newly established model could provide decision support for dry rubber yield prediction of rubber plantation over large areas.

Establishment and verification of a new prediction model for dry rubber yield

Transpiration rate of rubber tree(Hevea brasiliensis) was measured continuously from February to November in 2013,using the Granier's thermal dissipation probe method. The main environmental factors(including air temperature,relative humidity,photosynthetically active radiation(PAR) and soil moisture) were also measured simultaneously. The results showed that the transpiration rate of rubber tree exhibited a unimodal pattern,with the value being higher during the daytime and lower at night. The average transpiration rate and daily transpiration of sunny day were 4 times more than those of rainy day. The transpiration started 0. 5- 1. 0 h earlier and the peak time was 2. 0- 4. 5 h earlier during the rainy season than during the dry season.During the study period,the average daily transpiration was 27. 84 kg·d- 1. The largest amount of stand transpiration(54. 3 mm) occurred in April and minimum(29. 6 mm) in November.Environmental factors in terms of their effects on the transpiration rate were ranked as air temperature effects air relative humidity PAR soil moisture in the dry season,and PAR air relative humidity air temperature soil moisture in the rainy season. Despite water deficit during the dry season,the rubber tree can get deep soil water due to its well-developed root system,and is not affected by severe water stress.

Characteristics of transpiration of rubber trees( Hevea brasiliensis) and its relationship with environmental factors

Handle everyday research tasks with reliable, citation-backed results

Your personal Research Agent to handle research tasks with citation-backed results

Popular Tasks used by Researchers

How can I help with your research?

Meet SciSpace

Get more enhanced response by uploading the PDFs you want me to reference.

No relevant PDFs in your library

SciSpace is the AI research assistant for academics. Run systematic literature reviews on 280M+ papers, and write papers with cited sources. Trusted by 1M+ students, PhDs & researchers.

SciSpace | AI for Research

Analyze PDFs

Code & Manuscripts

Funding & Grants

Literature & Patents

Medical & Clinical Data

Systematic Review

Visualize & Present

Web & Data

Build a Google Scholar-like website for your research.

Build a website

Create charts and images for your research

Create a Chart

Write a paper for submission to a journal

Draft a manuscript

Patent Search

Design eye-catching scientific posters in minutes.

Scientific Poster Generation

Systematic Literature Review

One task is running at the moment. Your messages will be shown right after.

Drag and drop or click here to browse

Loved by <highlight>1 million+</highlight> researchers

Extract a list of specific topics and their sources from unstructured text

Topics

Compare and analyze relevant papers that matches with your search

Papers

Get insights from PDFs and bookmarked papers from your library

My library

Recent searches

Try searching for:

Catch AI-generated content in scholarly and non-scholarly content

{ai} Detector

Ai Writer

Get PDF Summaries, highlighted text explanations 

Chat with PDF

Effortlessly create in-text citations and bibliographies in APA and 2,500 other formats

Citation generator

Get explanations, summaries, and answers on academic papers

Ease up your research workflow with {scispace}'s cohort of exciting AI tools

Elevate your academic writing skills and convey your ideas the way you want

Paraphraser

Explore our range of reading and writing tools

Your file is being prepared and should be ready in a few minutes. If it's a large file, it might take a bit longer. You can close this window, and we'll email you the file when it's done.

You have reached a maximum limit of <strong>{limit}</strong> columns in the table. Remove at least <strong>1</strong> column to add or create another one.

Zhao We

Author Tools

Chat about Author

Papers

Characteristics of transpiration of rubber trees( Hevea brasiliensis) and its relationship with environmental factors