Recruitment of Phalaris aquatica within existing swards 1. Effects of biomass manipulation, seed level modification and site preparation

Roshan Thapa, David Kemp, David Michalk

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6 Downloads (Pure)

Abstract

A successful recruitment event in perennial grasslands is infrequent and when it occurs, the rate of recruitment and survival is low, <1% in most occasions. This paper reports on two field experiments that investigated the effects of biomass manipulation, seed level modification and site preparation on the recruitment of Phalaris aquatica seedlings. The experiments were done through drier than average years, where P. aquatica achieved successful recruitment of seedlings. Recruitment rates proportional to total seed set were 1.3-13.3% in experiment 1 and 0.5-4.2% in experiment 2. The control treatment, on average, resulted in 352 seedlings/ m2 in experiment 1 and 16/m2 in experiment 2 compared to the best treatments which had 500/m2 and 38/m2 respectively, on average. There was poor seed set in experiment 2 before the recruitment event. Presence of existing biomass compared to either removing or leaving the plant material on the ground had greater success on seedling emergence, whereas seed addition had little effect suggesting that microsites may be more important than seed availability for P. aquatica seedling emergence. Soil scarification in general failed to have significant effects in both experiments. Seedlings survived until the following summer, but few then remained through the ensuing drought. This research showed that minimal intervention was needed to encourage emergence and early survival, and provides data on the mechanisms involved for recruitment of a perennial grass species in existing swards.
Original languageEnglish
Pages (from-to)701-711
Number of pages11
JournalCrop and Pasture Science
Volume62
Issue number8
Publication statusPublished - 2011

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Phalaris aquatica
site preparation
sward
biomass
seeds
seedling emergence
seed set
seedlings
grasslands
drought
grasses
summer

Cite this

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title = "Recruitment of Phalaris aquatica within existing swards 1. Effects of biomass manipulation, seed level modification and site preparation",
abstract = "A successful recruitment event in perennial grasslands is infrequent and when it occurs, the rate of recruitment and survival is low, <1{\%} in most occasions. This paper reports on two field experiments that investigated the effects of biomass manipulation, seed level modification and site preparation on the recruitment of Phalaris aquatica seedlings. The experiments were done through drier than average years, where P. aquatica achieved successful recruitment of seedlings. Recruitment rates proportional to total seed set were 1.3-13.3{\%} in experiment 1 and 0.5-4.2{\%} in experiment 2. The control treatment, on average, resulted in 352 seedlings/ m2 in experiment 1 and 16/m2 in experiment 2 compared to the best treatments which had 500/m2 and 38/m2 respectively, on average. There was poor seed set in experiment 2 before the recruitment event. Presence of existing biomass compared to either removing or leaving the plant material on the ground had greater success on seedling emergence, whereas seed addition had little effect suggesting that microsites may be more important than seed availability for P. aquatica seedling emergence. Soil scarification in general failed to have significant effects in both experiments. Seedlings survived until the following summer, but few then remained through the ensuing drought. This research showed that minimal intervention was needed to encourage emergence and early survival, and provides data on the mechanisms involved for recruitment of a perennial grass species in existing swards.",
keywords = "Open access version available, Insecticide, Seed addition, Seed set, Seedling recruitment, Seedling survival, Soil scarification",
author = "Roshan Thapa and David Kemp and David Michalk",
note = "Imported on 12 Apr 2017 - DigiTool details were: Journal title (773t) = Crop and Pasture Science. ISSNs: 1836-0947;",
year = "2011",
language = "English",
volume = "62",
pages = "701--711",
journal = "Crop and Pasture Science",
issn = "0004-9409",
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TY - JOUR

T1 - Recruitment of Phalaris aquatica within existing swards 1. Effects of biomass manipulation, seed level modification and site preparation

AU - Thapa, Roshan

AU - Kemp, David

AU - Michalk, David

N1 - Imported on 12 Apr 2017 - DigiTool details were: Journal title (773t) = Crop and Pasture Science. ISSNs: 1836-0947;

PY - 2011

Y1 - 2011

N2 - A successful recruitment event in perennial grasslands is infrequent and when it occurs, the rate of recruitment and survival is low, <1% in most occasions. This paper reports on two field experiments that investigated the effects of biomass manipulation, seed level modification and site preparation on the recruitment of Phalaris aquatica seedlings. The experiments were done through drier than average years, where P. aquatica achieved successful recruitment of seedlings. Recruitment rates proportional to total seed set were 1.3-13.3% in experiment 1 and 0.5-4.2% in experiment 2. The control treatment, on average, resulted in 352 seedlings/ m2 in experiment 1 and 16/m2 in experiment 2 compared to the best treatments which had 500/m2 and 38/m2 respectively, on average. There was poor seed set in experiment 2 before the recruitment event. Presence of existing biomass compared to either removing or leaving the plant material on the ground had greater success on seedling emergence, whereas seed addition had little effect suggesting that microsites may be more important than seed availability for P. aquatica seedling emergence. Soil scarification in general failed to have significant effects in both experiments. Seedlings survived until the following summer, but few then remained through the ensuing drought. This research showed that minimal intervention was needed to encourage emergence and early survival, and provides data on the mechanisms involved for recruitment of a perennial grass species in existing swards.

AB - A successful recruitment event in perennial grasslands is infrequent and when it occurs, the rate of recruitment and survival is low, <1% in most occasions. This paper reports on two field experiments that investigated the effects of biomass manipulation, seed level modification and site preparation on the recruitment of Phalaris aquatica seedlings. The experiments were done through drier than average years, where P. aquatica achieved successful recruitment of seedlings. Recruitment rates proportional to total seed set were 1.3-13.3% in experiment 1 and 0.5-4.2% in experiment 2. The control treatment, on average, resulted in 352 seedlings/ m2 in experiment 1 and 16/m2 in experiment 2 compared to the best treatments which had 500/m2 and 38/m2 respectively, on average. There was poor seed set in experiment 2 before the recruitment event. Presence of existing biomass compared to either removing or leaving the plant material on the ground had greater success on seedling emergence, whereas seed addition had little effect suggesting that microsites may be more important than seed availability for P. aquatica seedling emergence. Soil scarification in general failed to have significant effects in both experiments. Seedlings survived until the following summer, but few then remained through the ensuing drought. This research showed that minimal intervention was needed to encourage emergence and early survival, and provides data on the mechanisms involved for recruitment of a perennial grass species in existing swards.

KW - Open access version available

KW - Insecticide

KW - Seed addition

KW - Seed set

KW - Seedling recruitment

KW - Seedling survival

KW - Soil scarification

M3 - Article

VL - 62

SP - 701

EP - 711

JO - Crop and Pasture Science

JF - Crop and Pasture Science

SN - 0004-9409

IS - 8

ER -